Class: CADataFrame

Inherits:
Object
  • Object
show all
Defined in:
lib/carray-dataframe/join.rb,
lib/carray-dataframe/io.rb,
lib/carray-dataframe/join.rb,
lib/carray-dataframe/group.rb,
lib/carray-dataframe/pivot.rb,
lib/carray-dataframe/to_html.rb,
lib/carray-dataframe/arranger.rb,
lib/carray-dataframe/converter.rb,
lib/carray-dataframe/dataframe.rb,
lib/carray-dataframe/dataframe.rb,
lib/carray-dataframe/dataframe.rb,
lib/carray-dataframe/dataframe.rb,
lib/carray-dataframe/dataframe.rb,
lib/carray-dataframe/dataframe.rb,
lib/carray-dataframe/dataframe.rb,
lib/carray-dataframe/dataframe.rb,
lib/carray-dataframe/reference.rb,
lib/carray-dataframe/loc_accessor.rb,
lib/carray-dataframe/iloc_accessor.rb

Overview

CArray

Defined Under Namespace

Modules: Merge Classes: Arranger, ILocAccessor, LocAccessor, MergeFrame

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data, index: nil, columns: nil, order: nil, clone: false, &block) ⇒ CADataFrame

Constructor



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# File 'lib/carray-dataframe/dataframe.rb', line 13

def initialize (data, index: nil, columns: nil, order: nil, clone: false, &block)
  # @column_names = Array holds column names and its order
  # @column_data  = Hash holds data entities
  # @row_number   = Integer holds number of rows
  # @row_index    = CArray stores row index (any object)
  # @__methods__  = ...
  # Stores data entity
  
  case data
  when Hash
    raise "columns option is not needed for hash data" if columns
    @column_data  = columns_to_columns(data)
    @column_names = @column_data.keys
  when CArray
    if columns
      @column_names = columns.map(&:to_s)
    else
      if data.respond_to?(:column_names)
        if data.column_names.is_a?(Array)
          @column_names = data.column_names.map(&:to_s)
        else
          @column_names = data.dim1.times.map{|i| "c#{i}" }
        end
      elsif order
        @column_names = order.map(&:to_s)
      else
        raise "can't determin column names use columns or order option"
      end
    end
    if @column_names.size != data.dim1
      raise "mismatch between 'column_names' and table columns"
    end
    @column_data = table_to_columns(data)
  when Array
    case data.first
    when Hash
      @column_data = {}
      dummy = {}
      data.each do |hash|
        dummy.update(hash)
      end
      @column_names = []
      dummy.each_key do |k|
        list = []
        data.each do |hash|
          list << (hash[k] || UNDEF)
        end
        name = k.to_s
        @column_names << name
        @column_data[name] = list.to_ca
      end
    else
      if columns
        @column_names = columns.map(&:to_s)
      elsif order
        @column_names = order.map(&:to_s)
      else
        raise "columns or order option should be given"
      end
      @column_data = array_to_columns(data)
    end
  else
    raise "unknown data"
  end
  
  if order
    if @column_names.size != order.size
      raise 'invalid order option'
    end
    new_column_data = {}
    order.each do |key|
      if @column_data.has_key?(key.to_s)
        new_column_data[key.to_s] = @column_data[key.to_s]
      else
        raise 'invalid column name '#{key.to_s}' in order option'
      end
    end
    @column_data  = new_column_data
    @column_names = new_column_data.keys
  end

  # Sets @row_number and check column length
  if @column_data.empty? and index
    @row_number = index.size
  else
    @row_number   = @column_data.first[1].size
    if @column_names.any?{ |key| @column_data[key].size != @row_number }
      raise "column sizes mismatch"
    end
  end

  # Processing option 'index'
  set_index(index, inplace: true)
  @__methods__ = {}

  if clone
    raise NotImplementedError, "copy option is not implemented"
  end

  if block_given?
    arrange(&block)
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 308

def method_missing (name, *args)
  if args.size == 0
    name = name.to_s
    if has_column?(name)
      return @column_data[name]
    elsif has_column?(name.gsub(/_/,'.')) ### For R
      return @column_data[name.gsub(/_/,'.')]
    elsif @__methods__.include?(name)
      return @column_data[@__methods__[name]]
    end
  end
  raise "no method '#{name}' for CADataFrame"
end

Instance Attribute Details

#column_data ⇒ Object (readonly)

Returns the value of attribute column_data.



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# File 'lib/carray-dataframe/dataframe.rb', line 117

def column_data
  @column_data
end

#column_names ⇒ Object (readonly)

Returns the value of attribute column_names.



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# File 'lib/carray-dataframe/dataframe.rb', line 117

def column_names
  @column_names
end

#row_index ⇒ Object (readonly)

Returns the value of attribute row_index.



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# File 'lib/carray-dataframe/dataframe.rb', line 117

def row_index
  @row_index
end

#row_number ⇒ Object (readonly)

Returns the value of attribute row_number.



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# File 'lib/carray-dataframe/dataframe.rb', line 117

def row_number
  @row_number
end

Class Method Details

.concat(*args) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 954

def self.concat (*args)
  ref = args.first
  column_names = ref.column_names
  new_columns = {}
  column_names.each do |name|
    list = args.map{|t| t.column(name) }
    if list.first.is_a?(CATimeIndex)
      new_columns[name] = CATimeIndex.concat(*list)
    else
      data_type = list.first.data_type
      new_columns[name] = CArray.bind(data_type, list, 0)
    end
  end
  list = args.map(&:row_index)
  if list.all?
    if list.first.is_a?(CATimeIndex)
      new_row_index = CATimeIndex.concat(*list)
    else
      new_row_index = CArray.join(*list).flatten
    end
  else
    new_row_index = nil
  end
  return CADataFrame.new(new_columns, index: new_row_index)
end

.from_csv(file, sep: ",", rs: $/, quote_char: '"', index: nil, &block) ⇒ Object 



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# File 'lib/carray-dataframe/io.rb', line 78

def self.from_csv (file, sep: ",", rs: $/, quote_char: '"', index: nil, &block)
  warn "CADataFrame.from_csv will be obsolete, use CADataFrame.parse_csv"
  self.parse_csv(file, sep: sep, rs: rs, index: index, &block)
end

.load(filename) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1321

def self.load (filename)
  out = open(filename, "r") {|io|
    Marshal.load(io)
  }    
  raise "invalid data" unless out.is_a?(CADataFrame)
  return out
end

.load_csv(file, sep: ",", rs: $/, encoding: nil, quote_char: '"', index: nil, &block) ⇒ Object 



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# File 'lib/carray-dataframe/io.rb', line 60

def self.load_csv (file, sep: ",", rs: $/, encoding: nil, quote_char: '"', index: nil, &block)
  warn "CADataFrame.load_csv will be obsolete, use CADataFrame.read_csv"
  self.read_csv(file, sep: sep, rs: rs, quote_char: quote_char, encoding: encoding, &block)
end

.load_sqlite3(*args) ⇒ Object 



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# File 'lib/carray-dataframe/io.rb', line 34

def self.load_sqlite3 (*args)
  df = CArray.load_sqlite3(*args).to_dataframe
  if df
    return df.arrange{ 
      column_names.each do |name|
        mask name, nil
      end
    }
  else
    return nil
  end
end

.merge(*args) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 943

def self.merge (*args)
  ref = args.first
  new_columns = {}
  args.each do |table|
    table.column_names.each do |name|
      new_columns[name] = table.col(name)
    end
  end
  return CADataFrame.new(new_columns, index: ref.row_index)
end

.parse_csv(file, sep: ",", rs: $/, quote_char: '"', index: nil, &block) ⇒ Object 



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# File 'lib/carray-dataframe/io.rb', line 65

def self.parse_csv (file, sep: ",", rs: $/, quote_char: '"', index: nil, &block)
  df = CArray.parse_csv(file, sep: sep, rs: rs, quote_char: quote_char, &block).to_dataframe(index: index)
  if df
    return df.arrange{ 
      column_names.each do |name|
        mask name, nil
      end
    }
  else
    return nil
  end
end

.read_csv(file, sep: ",", rs: $/, quote_char: '"', encoding: nil, index: nil, &block) ⇒ Object 



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# File 'lib/carray-dataframe/io.rb', line 47

def self.read_csv (file, sep: ",", rs: $/, quote_char: '"', encoding: nil, index: nil, &block)
  df = CArray.read_csv(file, sep: sep, rs: rs, quote_char: quote_char, encoding: encoding, &block).to_dataframe(index: index)
  if df
    return df.arrange{ 
      column_names.each do |name|
        mask name, nil
      end
    }
  else
    return nil
  end
end

Instance Method Details

#-@ ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 988

def -@
  return cmp(:-@)
end

#<(other) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 992

def < (other)
  return cmp(:<, other)
end

#<=(other) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 996

def <= (other)
  return cmp(:<=, other)
end

#>(other) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1000

def > (other)
  return cmp(:>, other)
end

#>=(other) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1004

def >= (other)
  return cmp(:>=, other)
end

#[](arg, opt = :__dummy__) ⇒ Object 



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# File 'lib/carray-dataframe/reference.rb', line 73

def [] (arg, opt = :__dummy__)
  if opt != :__dummy__
    return loc[arg, opt]
  else
    case arg
    when Range
      if arg.begin.is_a?(Integer)
        return iloc[arg] unless @row_index
      end
      return loc[arg]
    when CArray
      if arg.rank == 1
        return loc[arg]
      else
        raise "index should be 1-dim array"
      end
    when String, Symbol
      return column(arg.to_s)
    else
      column_selector = select_columns(arg)
      new_columns = {}
      column_selector.each do |key|
        new_columns[key] = @column_data[key]
      end
      return CADataFrame.new(new_columns, index: @row_index)
    end
  end
end

#[]=(arg, opt = :__dummy__, value) ⇒ Object 



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# File 'lib/carray-dataframe/reference.rb', line 102

def []= (arg, opt = :__dummy__, value)
  if opt != :__dummy__
    loc[arg, opt] = value
  else
    case arg
    when Range
      if arg.begin.is_a?(Integer)
        iloc[arg] = value unless @row_index
      end
      loc[arg] = value
    when CArray
      loc[arg] = value
    when String, Symbol
      if column(arg.to_s)
        column(arg.to_s)[] = value
      else
        arrange {
          append arg, value
        }
      end
    else
      case value
      when CADataFrame
        column_selector = select_columns(arg)
        values = column_selector.each_index.map { |i| 
          value.column(i).to_ca
        }
        column_selector.each_with_index do |key, i|
          column(key)[] = values[i]
        end
      else
        column_selector = select_columns(arg)
        column_selector.each do |key|
          column(key)[] = value
        end        
      end
    end
  end
end

#__methods__ ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 123

def __methods__
  return @__methods__
end

#add_suffix(suf) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 728

def add_suffix (suf)
  new_columns = {}
  each_column_name do |name|
    new_name = (name.to_s + suf).to_s
    new_columns[new_name] = column(name)
  end
  return CADataFrame.new(new_columns, index: @row_index)
end

#append_column(name, new_column = nil, &block) ⇒ Object Also known as: append 



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# File 'lib/carray-dataframe/dataframe.rb', line 460

def append_column (name, new_column = nil, &block)
  name = name.to_s
  if new_column
    # do nothing
  elsif block
    new_column = instance_exec(self, &block)
  else
    new_column = @column_data.first[1].template(:object)
  end
  unless new_column.is_a?(CArray)
    new_column = new_column.to_ca
  end
  if new_column.rank != 1 or new_column.size != @row_number
    raise "invalid shape of appended column"
  end
  @column_names.push(name)
  @column_data[name] = new_column
  return new_column
end

#arrange(&block) ⇒ Object

Arrange



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# File 'lib/carray-dataframe/dataframe.rb', line 433

def arrange (&block)
  return Arranger.new(self).arrange(&block)
end

#ascii_table(rowmax = :full, time_format: nil, index: true) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 833

def ascii_table (rowmax = :full, time_format: nil, index: true)
  columns = @column_data.clone
  @column_names.each do |name|
    if columns[name].is_a?(CATimeIndex)
      if time_format
        columns[name] = columns[name].time.time_strftime(time_format)
      else
        columns[name] = columns[name].time.time_strftime("%F %T%:z")
      end
    end
  end
  if index
    if @row_index
      namelist = ["    "] + @column_names
      if @row_index.is_a?(CATimeIndex)
        if time_format
          row_index = @row_index.time.time_strftime(time_format)
        else
          row_index = @row_index.time.time_strftime("%F %T%:z")
        end
      else
        row_index = @row_index
      end
      tbl = CADFArray.new(namelist, columns.update("    " => row_index))
    else
      namelist = ["    "] + @column_names
      tbl = CADFArray.new(namelist, columns.update("    " => CArray.int(@row_number).seq))
    end
  else
    namelist = @column_names
    tbl = CADFArray.new(namelist, columns)
  end
  if rowmax.is_a?(Integer) and @row_number > rowmax
    list = tbl[0..(rowmax/2),nil].to_a
    list.push namelist.map { "..." }
    list.push *(tbl[-rowmax/2+1..-1,nil].to_a)
    tbl = list.to_ca
  end
  datastr = tbl.convert {|c| __obj_to_string__(c) }.unmask("")
  datamb  = datastr.convert(:boolean, &:"ascii_only?").not.sum(0).ne(0)
  namemb  = namelist.to_ca.convert(:boolean) {|c| c.to_s.ascii_only? }.eq(0)
  mb      = datamb.or(namemb)
  namelen = namelist.map(&:length).to_ca
  datalen = datastr.convert(&:length)
  if mb.max == 0
    if datalen.size == 0
      lengths  = namelen.to_a
    else
      lengths  = datalen.max(0).pmax(namelen).to_a
    end
    hrule  = "-" + lengths.map {|len| "-"*len}.join("--") + "-"
    header = " " +
             [namelist, lengths].transpose.map{|name, len|
                                          "#{name.to_s.ljust(len)}" }.join("  ") + " "
    ary = [hrule, header, hrule]
	if datalen.size > 0
     datastr[:i,nil].each_with_index do |blk, i|
       list = blk.flatten.to_a
       ary << " " + [list, lengths].transpose.map{|value, len|
                                          "#{value.ljust(len)}"}.join("  ") + " "
     end
	end
    ary << hrule
    return "DataFrame: rows#=#{@row_number}: \n" + ary.join("\n")
  else
    namewidth  = namelist.to_ca.convert{|c| __strwidth__(c.to_s) }
    if datalen.size == 0
      maxwidth   = namewidth
    else
      datawidth  = datastr.convert{|c| __strwidth__(c.to_s) }
      maxwidth   = datawidth.max(0).pmax(namewidth)
    end
    len = maxwidth[:*,nil] - datawidth + datalen
    hrule  = "-" + maxwidth.map {|len| "-"*len}.join("--") + "-"
    header = " " +
             [namelist, maxwidth.to_a].transpose.map{|name, len|
                                          "#{name.to_s.ljust(len-__strwidth__(name.to_s)+name.to_s.length)}" }.join("  ") + " "
    ary = [hrule, header, hrule]
	if datalen.size > 0
     datastr[:i,nil].each_with_addr do |blk, i|
       list = blk.flatten.to_a
       ary << " " + list.map.with_index {|value, j|
                 "#{value.ljust(len[i,j])}"}.join("  ") + " "
     end
	end
    ary << hrule
    return "DataFrame: row#=#{@row_number}: \n" + ary.join("\n")
  end
end

#ca(*names) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 756

def ca (*names)
  if names.empty?
    return CADFArray.new(@column_names, @column_data)
  else
    return CADFArray.new(names.map(&:to_s), @column_data)
  end
end

#calculate(label, &block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 574

def calculate (label, &block)
  hash = {}
  each_column_name do |name|
    begin
      if block
        hash[name] = [yield(name, column(name))]
      else
        hash[name] = [column(name).send(label.intern)]
      end
    rescue
      hash[name] = [UNDEF]
    end
  end
  return CADataFrame.new(hash, index: [label])
end

#classify(name, scale = nil, opt = {}) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1070

def classify (name, scale = nil, opt = {})
  if not scale
    column = @column_data[name.to_s]
    mids   = column.uniq
    mapper = {}
    mids.each_with_index do |v,i|
      mapper[v] = i
    end
    cls = columns.convert(:int32) {|v| mapper[v] }
    hash = {
      "#{name}_M" => mids,
      "#{name}_L" => mids,
      "#{name}_R" => mids,
      "#{name}_CLASS" => cls
    }
  else
    option = {
      :include_upper  => false,
      :include_lowest => true,
      :offset => 0,
    }.update(opt)
    column = @column_data[name.to_s]
    cls = scale.bin(column,
                    option[:include_upper],
                    option[:include_lowest],
                    option[:offset])
    mids = ((scale + scale.shifted(-1))/2)[0..-2].to_ca
    left = scale[0..-2]
    right = scale.shift(-1)[0..-2]
    hash = {
      "#{name}_M" => mids.project(cls).to_ca,
      "#{name}_L" => left.project(cls).to_ca,
      "#{name}_R" => right.project(cls).to_ca,
      "#{name}_CLASS" => cls
    }
  end
  return CADataFrame.new(hash)
end

#column(spec) ⇒ Object Also known as: col

Column, Row Access



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# File 'lib/carray-dataframe/dataframe.rb', line 247

def column (spec)
  case spec
  when Integer
    return @column_data[@column_names[spec]]
  when String, Symbol
    return @column_data[spec.to_s]
  else
    raise "invalid column specifier"
  end
end

#column_types ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 239

def column_types
  return @column_names.map{|name| @column_data[name].data_type_name }
end

#columns ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 119

def columns
  @column_data
end

#columns_to_hash(key_name, value_names) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 781

def columns_to_hash (key_name, value_names)
  hash = {}
  unless @column_names.include?(key_name)
    raise ArgumentError, "include invalid key column name #{key_name}"
  end
  case value_names
  when String
    unless @column_names.include?(value_names)
      raise ArgumentError, "invalid key column name #{value_names}"
    end
    key_columns = @column_data[key_name]
    value_columns = @column_data[value_names]
    @row_number.times do |i|
      hash[key_columns[i]] = value_columns[i]
    end
  when Array
    unless value_names.all?{|s| @column_names.include?(s) }
      raise ArgumentError, "include invalid column name in #{value_names.join(' ')}"
    end
    key_columns = @column_data[key_name]
    value_columns = @column_data.values_at(*value_names)
    @row_number.times do |i|
      hash[key_columns[i]] = value_columns.map{|c| c[i]}
    end
  else
    raise ArgumentError, "invalud argument"
  end
  return hash
end

#cross(name1, name2) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1109

def cross (name1, name2)
  col1 = column(name1)
  col2 = column(name2)
  var1 = col1.uniq.sort
  var2 = col2.uniq.sort
  hash = {}
  count = Hash.new {0}
  var1.each do |v1|
    var2.each do |v2|
      hash[[v1,v2]] = 0
    end
  end
  list = CArray.join([col1, col2]).to_a
  list.each do |item|
    hash[item] += 1
  end
  out = CArray.object(var1.size, var2.size) { 0 }
  var1.each_with_index do |v1, i|
    var2.each_with_index do |v2, j|
      out[i,j] = hash[[v1,v2]]
    end
  end
  return CADataFrame.new(out, index: var1, columns: var2)
end

#delete_masked_rows ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 657

def delete_masked_rows
  not_masked = @column_data.first[1].template(:boolean) { true }
  @column_names.each do |name|
    not_masked &= @column_data[name].is_not_masked
  end
  columns = {}
  @column_names.each_with_index do |name, i|
    columns[name] = @column_data[name].to_ca[not_masked]
  end
  return CADataFrame.new(columns)
end

#delete_rows(&block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 669

def delete_rows (&block)
  masked = instance_eval(&block)
  columns = {}
  @column_names.each_with_index do |name, i|
    columns[name] = @column_data[name].to_ca[masked]
  end
  return CADataFrame.new(columns)
end

#describe ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1243

def describe
  list = []
  @column_data.each do |name, column|
    list << column.describe
  end
  CADataFrame.new(list, index: @column_names).transpose
end

#detouch ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 646

def detouch
  @column_data = @column_data.clone
  each_column_name do |name|
    @column_data[name] = @column_data[name].to_ca
  end
  if @row_index
    @row_index = @row_index.clone
  end
  return self
end

#downcase ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 448

def downcase
  new_column_names = []
  new_columns = {}
  each_column_name do |name|
    new_column_names << name.downcase
    new_columns[name.downcase] = @column_data[name]
  end
  @column_names = new_column_names
  @column_data = new_columns
  return self
end

#drop_column(*columns) ⇒ Object Also known as: eliminate_column 



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# File 'lib/carray-dataframe/dataframe.rb', line 524

def drop_column (*columns)
  if columns.empty?
    return self
  else
    names = []
    columns.each do |c|
      case c
      when String
        names << c
      when Symbol
        names << c.to_s
      when Regexp
        names.push *@column_names.grep(c)
      else
        raise "invalid column specification"
      end
    end
  end
  new_columns = {}
  each_column_name do |name|
    unless names.include?(name)
      new_columns[name] = column(name)
    end
  end
  return replace CADataFrame.new(new_columns, index: @row_index)
end

#each_column(&block) ⇒ Object

Iterators



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# File 'lib/carray-dataframe/dataframe.rb', line 326

def each_column (&block)
  return @column_data.each(&block)
end

#each_column_name(&block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 330

def each_column_name (&block)
  return @column_names.each(&block)
end

#each_row(with: Array, columns: nil, &block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 342

def each_row (with: Array, columns: nil, &block)
  case columns
  when Array
    column_names = columns
  when Regexp
    column_names = @column_names.grep(columns)
  else
    column_names = @column_names
  end
  if with == Array
    @row_number.times do |i|
      yield column_names.map{|n| @column_data[n][i] }
    end
  elsif with == Hash
    row = {}
    @row_number.times do |i|
      column_names.each do |c|
        row[c] = @column_data[c][i]
      end
      yield row
    end
  elsif with == CArray
    joined = CArray.join(@column_data.values_at(*column_names))
    joined[:i,nil].each do |block|
      yield block.to_ca.compact
    end
  else
    raise "invalid data type for loop variable"
  end
end

#each_row_index(&block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 334

def each_row_index (&block)
  if @row_index
    @row_index.each(&block)
  else
    @row_number.times(&block)
  end
end

#each_row_with_row_index(with: Array, &block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 373

def each_row_with_row_index (with: Array, &block)
  if with == Array
    if @row_index
      @row_index.each_with_index do |idx, i|
        yield @column_data.map{|n,c| c[i] }, idx
      end
    else
      @row_number.times do |i|
        yield @column_data.map{|n,c| c[i] }, i
      end
    end
  elsif with == Hash
    row = {}
    if @row_index
      @row_index.each_with_index do |idx, i|
        @column_names.each do |c|
          row[c] = @column_data[c][i]
        end
        yield row, @row_index[i]
      end
    else
      @row_number.times do |idx, i|
        @column_names.each do |c|
          row[c] = @column_data[c][i]
        end
        yield row, @row_index[i]
      end
    end
  else
    raise "invalid  data type for loop variable"
  end
end

#execute(&block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 565

def execute (&block)
  case block.arity
  when 1
    return instance_exec(self, &block)
  else
    return instance_exec(&block)
  end
end

#fill(*names, value) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 420

def fill (*names, value)
  names.each do |name|
    if has_column?(name)
      column(name).fill(value)
    end
  end
  return self
end

#get_dummies(*names, prefix: nil, prefix_sep: "_") ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1277

def get_dummies (*names, prefix: nil, prefix_sep: "_")
  keep_columns = {}
  new_columns  = {}
  k = 0
  @column_names.each do |name|
    unless names.include?(name)
      keep_columns[name] = @column_data[name]
      next
    end
    hash = @column_data[name].get_dummies
    case prefix
    when nil
      hash.each do |v, dummy|
        new_columns["#{name}#{prefix_sep}#{v}"] = dummy
      end
    when String
      hash.each do |v, dummy|
        new_columns["#{prefix}#{prefix_sep}#{v}"] = dummy
      end        
    when Array
      hash.each do |v, dummy|
        new_columns["#{prefix[k]}#{prefix_sep}#{v}"] = dummy
      end
    when Hash
      hash.each do |v, dummy|
        new_columns["#{prefix[name]}#{prefix_sep}#{v}"] = dummy
      end
    end
    k += 1
  end
  CADataFrame.new(keep_columns.update(new_columns), index: @row_index)
end

#group_by(*names) ⇒ Object 



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# File 'lib/carray-dataframe/group.rb', line 9

def group_by (*names)
  if names.size == 1
    return CADataFrameGroup.new(self, names[0])
  else
    return CADataFrameGroupMulti.new(self, *names)
  end
end

#has_column?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/carray-dataframe/dataframe.rb', line 230

def has_column? (name)
  case name.to_s
  when "index"
    return has_index?
  else
    return @column_names.include?(name)
  end
end

#has_index? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/carray-dataframe/dataframe.rb', line 217

def has_index?
  @row_index ? true : false
end

#head(n = 10) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 290

def head (n=10)
  rmax = [@row_number, n].min
  return row[0..rmax-1]
end

#histogram(name, scale = nil, options = nil) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1050

def histogram (name, scale = nil, options = nil)
  if scale.nil?
    return group_by(name).table{ { :count => col(name).count_valid } }
  else
    if options
      hist = CAHistogram.int(scale, options)
    else
      hist = CAHistogram.int(scale)
    end
    hist.increment(@column_data[name.to_s])
    hash = {
      name.to_s => hist.midpoints[0],
      "#{name}_L".to_s => scale[0..-2],
      "#{name}_R".to_s => scale.shift(-1)[0..-2],
      :count => hist[0..-2].to_ca,
    }
    return CADataFrame.new(hash)
  end
end

#iloc(&block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 276

def iloc (&block)
  @iloc ||= CADataFrame::ILocAccessor.new(self)
  return @iloc 
end

#index ⇒ Object

TO BE FIXED



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# File 'lib/carray-dataframe/dataframe.rb', line 282

def index
  if @row_index
    return @row_index.to_ca
  else
    return CArray.int(@row_number).seq
  end
end

#insert_column(pos, name, new_column = nil, &block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 480

def insert_column (pos, name, new_column = nil, &block)
  name = name.to_s
  if new_column
    # do nothing
  elsif block
    new_column = instance_exec(self, &block)
  else
    new_column = @column_data.first[1].template(:object)
  end
  unless new_column.is_a?(CArray)
    new_column = new_column.to_ca
  end
  if new_column.rank != 1 or new_column.size != @row_number
    raise "invalid shape of appended column"
  end
  @column_names.insert(pos, name)
  @column_data[name] = new_column
  return new_column
end

#inspect ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 923

def inspect
  return ascii_table(8)
end

#is_finite ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1012

def is_finite
  return cmp(:is_finite)
end

#is_masked ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1008

def is_masked
  return cmp(:is_masked)
end

#join(other_df, opts = {}) ⇒ Object 



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# File 'lib/carray-dataframe/join.rb', line 26

def join(other_df,opts={})
  CADataFrame::Merge.join(self, other_df, opts)
end

#loc ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 271

def loc
  @loc ||= CADataFrame::LocAccessor.new(self)
  return @loc 
end

#matchup(keyname, reference) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1031

def matchup (keyname, reference)
  key = column(keyname)
  idx = reference.matchup(key)
  new_columns = {}
  each_column_name do |name|
    if name == keyname.to_s
      new_columns[name] = reference
    else
      new_columns[name] = column(name).project(idx)
    end
  end
  if @row_index
    new_row_index = @row_index.project(idx).unmask(nil)
  else
    new_row_index = nil
  end
  return CADataFrame.new(new_columns, index: new_row_index)
end

#mean ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1150

def mean
  new_columns = {}
  each_column do |name, col|
    new_columns[name] = [col.mean]
  end
  return CADataFrame.new(new_columns, index: ["mean"])
end

#merge(*args) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 561

def merge (*args)
  return CADataFrame.merge(self, *args)
end

#method(hash) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 300

def method (hash)
  new_hash = {}
  hash.each do |key, value|
    new_hash[key.to_s] = value.to_s
  end
  @__methods__.update(new_hash)
end

#objectify ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 748

def objectify
  new_columns = {}
  each_column_name do |name|
    new_columns[name] = column(name).object
  end
  return CADataFrame.new(new_columns, index: @row_index)
end

#order_by(*names, &block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 690

def order_by (*names, &block)
  if names.empty?
    if block
      ret = instance_exec(&block)
      case ret
      when CArray
        list = [ret]
      when Array
        list = ret
      end
    end
  else
    list = @column_data.values_at(*names.map{|s| s.to_s})
  end
  return reorder { CA.sort_addr(*list) }
end

#pivot(name1, name2) ⇒ Object 



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# File 'lib/carray-dataframe/pivot.rb', line 8

def pivot (name1, name2)
  return CADataFramePivot.new(self, name1, name2)
end

#prepend_column(name, new_column = nil, &block) ⇒ Object Also known as: lead 



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# File 'lib/carray-dataframe/dataframe.rb', line 502

def prepend_column (name, new_column = nil, &block)
  name = name.to_s
  if new_column
    # do nothing
  elsif block
    new_column = instance_exec(self, &block)
  else
    new_column = @column_data.first[1].template(:object)
  end
  unless new_column.is_a?(CArray)
    new_column = new_column.to_ca
  end
  if new_column.rank != 1 or new_column.size != @row_number
    raise "invalid shape of appended column"
  end
  @column_names.unshift(name)
  @column_data[name] = new_column
  return new_column
end

#rename(name1, name2) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 437

def rename (name1, name2)
  if idx = @column_names.index(name1.to_s)
    @column_names[idx] = name2.to_s
    column = @column_data[name1.to_s]
    @column_data.delete(name1.to_s)
    @column_data[name2.to_s] = column
  else
    raise "unknown column name #{name1}"
  end
end

#reorder(&block) ⇒ Object

Transformation



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# File 'lib/carray-dataframe/dataframe.rb', line 681

def reorder (&block)
  index = instance_exec(&block)
  new_columns = {}
  each_column_name do |name|
    new_columns[name] = column(name)[index]
  end
  return CADataFrame.new(new_columns, index: @row_index ? @row_index[index] : nil)
end

#replace(other) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 221

def replace (other)
  @column_names = other.column_names
  @column_data  = other.column_data
  @row_index    = other.row_index
  @row_number   = other.row_number
  @__methods__  = other.__methods__
  return self
end

#resample(&block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 590

def resample (&block)
  new_columns = {}
  each_column_name do |name|
    begin
      new_columns[name] = yield(name, column(name))
    rescue
    end
  end
  return CADataFrame.new(new_columns)
end

#reverse ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 707

def reverse
  new_columns = {}
  each_column_name do |name|
    new_columns[name] = column(name).reverse
  end
  return CADataFrame.new(new_columns, index: @row_index ? @row_index.reverse : nil)
end

#save(filename) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1315

def save (filename)
  open(filename, "w") {|io|
    Marshal.dump(self, io)
  }
end

#select(*columns, &block) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 601

def select (*columns, &block)
  if columns.empty?
    names = @column_names
  else
    names = []
    columns.each do |c|
      case c
      when String
        names << c
      when Symbol
        names << c.to_s
      when Regexp
        names.push *@column_names.grep(c)
      else
        raise "invalid column specification"
      end
    end
  end
  if block
    row = instance_exec(&block)
  else
    row = nil
  end
  new_columns = {}
  names.map(&:to_s).each do |name|
    raise "unknown column '#{name}'" unless column(name)
    new_columns[name] = column(name)[row]
  end
  return CADataFrame.new(new_columns, index: @row_index ? @row_index[row] : nil)
end

#select_columns(selector = nil) ⇒ Object 



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# File 'lib/carray-dataframe/reference.rb', line 4

def select_columns (selector = nil)
  case selector
  when nil                       ### all
    return @column_names
  when Integer
    name = @column_names[selector]
    raise "invalid column index" unless selector
    return [name]
  when String, Symbol            ### "AAA"
    if @column_names.include?(selector.to_s)
      return [selector.to_s]
    else
      raise "invalid column specified #{selector}"
    end
  when Array                     ### ["AAA", "BBB"]
    if selector.size == 1 && selector.first.is_a?(Hash)
      return select_columns(selector.first)
    else
      selector.each do |name|
        unless @column_names.include?(name.to_s)
          raise "invalid column specified #{name}"
        end
      end
      return selector.map(&:to_s)
    end
  when Range                     ### "AAA".."BBB", 0..1
    case selector.begin
    when nil
      idx1 = 0
    when Integer
      idx1 = selector.begin
    when String, Symbol
      idx1 = @column_names.search(selector.begin.to_s)
      raise "can't find column #{selector.begin}" unless idx1
    else
      raise "invalid column specified #{selector.begin}"
    end
    if selector.exclude_end?
      case selector.end
      when nil
        idx2 = -2
      when Integer
        idx2 = selector.end - 1
      when String
        idx2 = @column_names.search(selector.end.to_s) 
        raise "can't find column #{selector.end}" unless idx2
        idx2 = idx2 - 1
      else
        raise "invalid column specified #{selector.end}"
      end        
    else
      case selector.end
      when nil
        idx2 = -1
      when Integer
        idx2 = selector.end
      when String
        idx2 = @column_names.search(selector.end.to_s)
        raise "can't find column #{selector.end}" unless idx2
      else
        raise "invalid column specified #{selector.end}"
      end
    end
    return @column_names[idx1..idx2]
  else
    raise "invalid column selector #{selector}"              
  end
end

#set_index(index, drop: true, inplace: false) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 195

def set_index (index, drop: true, inplace: false)
  if inplace
    case index
    when nil
    when String, Symbol
      index = index.to_s
      raise "can't find column named '#{index}'" unless @column_names.include?(index)
      if drop
        @row_index = @column_data.delete(index)
        @column_names.delete(index)
      else
        @row_index = @column_data[index]
      end
    else
      @row_index = index.to_ca
    end
    self
  else
    return to_df.set_index(index, drop: drop, inplace: true)
  end
end

#sum ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1142

def sum
  new_columns = {}
  each_column do |name, col|
    new_columns[name] = [col.sum]
  end
  return CADataFrame.new(new_columns, index: ["sum"])
end

#summary(*names) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 1251

def summary (*names)
  data = []
  names.each do |name|
    data << @column_data[name].summary
  end
  CADataFrame.new(data, index: names).transpose        
end

#tail(n = 10) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 295

def tail (n=10)
  rmin = -([@row_number, n].min)
  return row[rmin..-1]
end

#to_a(with_index: true) ⇒ Object 



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# File 'lib/carray-dataframe/converter.rb', line 31

def to_a (with_index: true)
  if @row_index and with_index
    namelist = [""] + @column_names
    tbl = CADFArray.new(namelist, @column_data.clone.update("" => index))
  else
    tbl = ca.to_ca
  end
  return tbl.to_a
end

#to_ary ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 931

def to_ary
  return [to_s]
end

#to_ca(*names) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 764

def to_ca (*names)
  return ca(*names).to_ca
end

#to_csv(io = "", rs: $/, sep: ",", fill: "", with_index: true, time_format: nil, &block) ⇒ Object 



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# File 'lib/carray-dataframe/converter.rb', line 41

def to_csv (io = "", rs: $/, sep: ",", fill: "", with_index: true, time_format: nil, &block)
  if @row_index and with_index
    namelist = ["index"] + @column_names
    columns = @column_data.clone.update("index" => index)
  else
    namelist = @column_names
    columns = @column_data.clone
  end
  columns.each do |k, v|
    if v.is_a?(CATimeIndex)
      if time_format
        columns[k] = v.time.time_format(time_format)
      else
        columns[k] = v.time.convert(:object){|t| t.to_s}
      end
    end
  end
  tbl = CADFArray.new(namelist, columns)
  return tbl.to_csv(io, **{rs: rs, sep: sep, fill: fill}, &block)
end

#to_daru ⇒ Object 



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# File 'lib/carray-dataframe/converter.rb', line 62

def to_daru
  require "daru"
  columns = {}
  each_column_name do |name|
    columns[name] = column(name).object.unmask(nil).to_a
  end
  if @row_index
    return Daru::DataFrame.new(columns, index: @row_index.to_a, order: @column_names)
  else
    return Daru::DataFrame.new(columns, order: @column_names)
  end
end

#to_df ⇒ Object

Conversions



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# File 'lib/carray-dataframe/dataframe.rb', line 740

def to_df
  new_columns = {}
  each_column_name do |name|
    new_columns[name] = column(name)
  end
  return CADataFrame.new(new_columns, index: @row_index).detouch
end

#to_hash ⇒ Object Also known as: to_h 



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# File 'lib/carray-dataframe/dataframe.rb', line 768

def to_hash
  hash = {}
  if @row_index
    hash["index"] = @row_index
  end
  @column_data.each do |k,v|
    hash[k] = v.to_a
  end
  return hash
end

#to_html(threshold = 8, time_format: nil, index: true) ⇒ Object 



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# File 'lib/carray-dataframe/to_html.rb', line 3

def to_html (threshold = 8, time_format: nil, index: true)
  columns = @column_data.clone
  @column_names.each do |name|
    if columns[name].is_a?(CATimeIndex)
      if time_format
        columns[name] = columns[name].time.time_strftime(time_format)
      else
        columns[name] = columns[name].time.time_format("%F %T%:z")
      end
    end
  end
  if index
    if @row_index
      namelist = ["    "] + @column_names
      if @row_index.is_a?(CATimeIndex)
        if time_format
          row_index = @row_index.time.time_strftime(time_format)
        else
          row_index = @row_index.time.time_format("%F %T%:z")
        end
      else
        row_index = @row_index
      end
      tbl = CADFArray.new(namelist, columns.update("    " => row_index))
    else
      namelist = ["    "] + @column_names
      tbl = CADFArray.new(namelist, columns.update("    " => CArray.int(@row_number).seq))
    end
  else
    namelist = @column_names
    tbl = CADFArray.new(namelist, columns)
  end
  if threshold.is_a?(Integer) and @row_number > threshold
    list = tbl[0..(threshold/2),nil].to_a
    list.push namelist.map { "..." }
    list.push *(tbl[-threshold/2+1..-1,nil].to_a)
    tbl = list.to_ca
  end
  datastr = tbl.convert {|c| __obj_to_string__(c) }.unmask("")
  datamb  = datastr.convert(:boolean, &:"ascii_only?").not.sum(0).ne(0)
  namemb  = namelist.to_ca.convert(:boolean) {|c| c.to_s.ascii_only? }.eq(0)
  mb      = datamb.or(namemb)
  namelen = namelist.map(&:length).to_ca
  datalen = datastr.convert(&:length)
  if mb.max == 0
    if datalen.size == 0
      lengths  = namelen.to_a
    else
      lengths  = datalen.max(0).pmax(namelen).to_a
    end
    table_in = "<table>"
    header = "<thead><tr>" +
             [namelist, lengths].transpose.map{|name, len|
                "<th>#{name.to_s.ljust(len)}</th>"
             }.join() + "</tr></thead>"
    body_in = "<tbody>"
    ary = [table_in, header, body_in]
	if datalen.size > 0
     datastr[:i,nil].each_with_index do |blk, i|
       list = blk.flatten.to_a
       ary << "<tr>" + [list, lengths].transpose.map {|value, len|
                       "<td>#{value.ljust(len)}</td>"
                     }.join() + "</tr>"
     end
	end
    ary << "</tbody>"
    ary << "</table>"
    return "DataFrame: rows#=#{@row_number}: \n" + ary.join("\n")
  else
    namewidth  = namelist.to_ca.convert{|c| __strwidth__(c.to_s) }
    if datalen.size == 0
      maxwidth   = namewidth
    else
      datawidth  = datastr.convert{|c| __strwidth__(c.to_s) }
      maxwidth   = datawidth.max(0).pmax(namewidth)
    end
    len = maxwidth[:*,nil] - datawidth + datalen
    table_in = "<table>"
    header = "<thead><tr>" +
             [namelist, maxwidth.to_a].transpose.map{|name, len|
               "<th>#{name.to_s.ljust(len-__strwidth__(name.to_s)+name.to_s.length)}</th>"
             }.join() + "</tr></thead>"
    body_in = "<tbody>"
    ary = [table_in, header, body_in]
	if datalen.size > 0
     datastr[:i,nil].each_with_addr do |blk, i|
       list = blk.flatten.to_a
       ary << "<tr>" + list.map.with_index {|value, j|
                     
                         "<td>#{value.ljust(len[i,j])}</td>"
                        }.join() + "</tr>"
     end
	end
    ary << "</tbody>"
    ary << "</table>"
    return "DataFrame: row#=#{@row_number}: \n" + ary.join("\n")
  end
end

#to_s ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 927

def to_s
  return ascii_table
end

#to_sql(tablename) ⇒ Object 



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# File 'lib/carray-dataframe/io.rb', line 88

def to_sql (tablename)
  if @column_names.any?{ |s| s =~ /[\. \-]/ }
    columns = {}
    each_column_name do |name|
      name2 = name.gsub(/[\. \-]/, '_')
      columns[name2] = column(name)
    end
    df = CADataFrame.new(columns)
    return df.to_sqlite3(database: ":memory:", table: tablename)
  else
    return to_sqlite3(database: ":memory:", table: tablename)
  end
end

#to_sqlite3(**args) ⇒ Object 



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# File 'lib/carray-dataframe/io.rb', line 84

def to_sqlite3 (**args)
  self.to_ca.to_sqlite3(**args)
end

#to_xlsx(filename, sheet_name: 'Sheet1', with_row_index: false, &block) ⇒ Object 



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# File 'lib/carray-dataframe/converter.rb', line 75

def to_xlsx (filename, sheet_name: 'Sheet1', with_row_index: false, &block)
  require "caxlsx"
  xl = Axlsx::Package.new
  xl.use_shared_strings = true
  sheet = xl.workbook.add_worksheet(name: sheet_name)
  df = self.to_df.objectify.unmask("=NA()")
  if with_row_index
    sheet.add_row([""] + column_names)
    df.each_row_with_row_index(with: Array) do |list, i|
      sheet.add_row([i] + list)
    end
  else
    sheet.add_row(column_names)
    df.each_row(with: Array) do |list|
      sheet.add_row(list)
    end
  end
  if block_given?
    yield sheet
  end
  xl.serialize(filename)
end

#transpose(columns: nil) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 715

def transpose (columns: nil)
  if columns
    columns = columns.map(&:to_s)
  else
    if @row_index
      columns = @row_index.convert(:object) {|v| v.to_s }
    else
      columns = CArray.object(@row_number).seq("a",:succ)
    end
  end
  return CADataFrame.new(ca.transpose, index: @column_names.to_ca, columns: columns)
end

#unmask(value = nil) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 642

def unmask (value = nil)
  return to_df.unmask!(value)
end

#unmask!(value = nil) ⇒ Object

Maintenance



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# File 'lib/carray-dataframe/dataframe.rb', line 635

def unmask! (value = nil)
  each_column_name do |name|
    column(name).unmask(value)
  end
  return self
end

#vacant_copy ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 553

def vacant_copy
  new_columns = {}
  each_column_name do |key|
    new_columns[key] = CArray.object(0)
  end
  return CADataFrame.new(new_columns)
end

#where(mask, *args) ⇒ Object 



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# File 'lib/carray-dataframe/dataframe.rb', line 406

def where (mask, *args)
  mask.column_names.each do |key|
    if has_column?(key)
      case args.size
      when 1
        column(key)[mask.column(key).boolean.not] = args[0]
      when 2
        column(key)[mask.column(key).boolean.not] = args[0]
        column(key)[mask.column(key).boolean] = args[1]
      end
    end
  end
end