Module: Misc

Defined in:
lib/scout/misc.rb,
lib/scout/misc/math.rb,
lib/scout/misc/digest.rb,
lib/scout/misc/format.rb,
lib/scout/misc/helper.rb,
lib/scout/misc/insist.rb,
lib/scout/misc/system.rb,
lib/scout/misc/monitor.rb,
lib/scout/misc/filesystem.rb

Constant Summary collapse

Log2Multiplier = 
1.0 / Math.log(2.0)
Log10Multiplier = 
1.0 / Math.log(10.0)
MAX_ARRAY_DIGEST_LENGTH = 
100_000
COLOR_LIST = 
%w(#BC80BD #CCEBC5 #FFED6F #8DD3C7 #FFFFB3 #BEBADA #FB8072 #80B1D3 #FDB462 #B3DE69 #FCCDE5 #D9D9D9)
CHAR_SENCONDS = 
ENV["SCOUT_NOCOLOR"] == "true" ? "sec" : "″"
MAX_TTY_LINE_WIDTH = 
160

Class Method Summary collapse

Class Method Details

.abort_child(pid, wait = true) ⇒ Object 



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# File 'lib/scout/misc/system.rb', line 23

def self.abort_child(pid, wait = true)
  begin
    Process.kill("TERM", pid.to_i)
    wait_child(pid) if wait
  rescue
    Log.debug("Process #{pid} was not killed: #{$!.message}")
  end
end

.benchmark(repeats = 1, message = nil) ⇒ Object 



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# File 'lib/scout/misc/monitor.rb', line 7

def self.benchmark(repeats = 1, message = nil)
  require 'benchmark'
  res = nil
  begin
    measure = Benchmark.measure do
      repeats.times do |i|
        res = yield i
      end
    end
    if message
      puts "#{message }: #{ repeats } repeats"
    else
      puts "Benchmark for #{ repeats } repeats (#{caller.first})"
    end
    puts measure
  rescue Exception
    puts "Benchmark aborted"
    raise $!
  end
  res
end

.camel_case(string) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 112

def self.camel_case(string)
  return string if string !~ /_/ && string =~ /[A-Z]+.*/
    string.split(/_|(\d+)/).map{|e| 
      (e =~ /^[A-Z]{2,}$/ ? e : e.capitalize) 
    }.join
end

.camel_case_lower(string) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 119

def self.camel_case_lower(string)
    string.split('_').inject([]){ |buffer,e| 
      buffer.push(buffer.empty? ? e.downcase : (e =~ /^[A-Z]{2,}$/ ? e : e.capitalize)) 
    }.join
end

.children(ppid = nil) ⇒ Object 



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# File 'lib/scout/misc/system.rb', line 9

def self.children(ppid = nil)
  require 'sys/proctable'

  ppid ||= Process.pid
  Sys::ProcTable.ps.select{ |pe| pe.ppid == ppid }
end

.chunk(array, size) ⇒ Object

Divides the array into chunks of size size by taking consecutive elements. If a block is given it runs it instead of returning the chunks



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# File 'lib/scout/misc/helper.rb', line 34

def self.chunk(array, size)
  total = array.length
  current = 0
  res = [] unless block_given?
  while current < total
    last = current + size - 1
    if block_given?
      yield array[current..last]
    else
      res << array[current..last]
    end
    current = last + 1
  end
  block_given? ? nil : res
end

.colors_for(list) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 4

def self.colors_for(list)
  unused = COLOR_LIST.dup

  used = {}
  colors = list.collect do |elem|
    if used.include? elem
      used[elem]
    else
      color = unused.shift
      used[elem]=color
      color
    end
  end

  [colors, used]
end

.counts(array) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 76

def self.counts(array)
  counts = {}
  array.each do |e|
    counts[e] ||= 0
    counts[e] += 1
  end

  counts
end

.digest(obj) ⇒ Object 



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# File 'lib/scout/misc/digest.rb', line 54

def self.digest(obj)
  str = String === obj ? obj : Misc.digest_str(obj)
  Digest::MD5.hexdigest(str)
end

.digest_file(file) ⇒ Object 



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# File 'lib/scout/misc/digest.rb', line 78

def self.digest_file(file)
  file = file.find if Path === file
  file = File.expand_path(file)
  if File.size(file) > 10_000_000
    fast_file_md5(file)
  else
    file_md5(file)
  end
end

.digest_str(obj) ⇒ Object 



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# File 'lib/scout/misc/digest.rb', line 4

def self.digest_str(obj)
  if obj.respond_to?(:digest_str)
    obj.digest_str
  else
    case obj
    when String
      if Path.is_filename?(obj) && Open.exists?(obj)
        if File.directory?(obj)
          "Directory MD5: #{digest_str(Dir.glob(File.join(obj, "*")))}"
        else
          "File MD5: #{Misc.digest_file(obj)}"
        end
      else
        obj.dup
      end
    when Integer, Symbol
      obj.to_s
    when Array
      if obj.length > MAX_ARRAY_DIGEST_LENGTH
        length = obj.length
        mid = length/2
        sample_pos = [1, 2, mid, length-2, length-1]
        "[#{length}:" << obj.values_at(*sample_pos).inject(""){|acc,o| acc.empty? ? Misc.digest_str(o) : acc << ', ' << Misc.digest_str(o) } << ']'
      else
        '[' << obj.inject(""){|acc,o| acc.empty? ? Misc.digest_str(o) : acc << ', ' << Misc.digest_str(o) } << ']'
      end
    when Hash
      '{' << obj.inject(""){|acc,p| s = Misc.digest_str(p.first) << "=" << Misc.digest_str(p.last); acc.empty? ? s : acc << ', ' << s } << '}'
    when Integer
      obj.to_s
    when Float
      if obj % 1 == 0
        obj.to_i.to_s
      elsif obj.abs > 10
        "%.1f" % obj
      elsif obj.abs > 1
        "%.3f" % obj
      else
        "%.6f" % obj
      end
    when TrueClass
      "true"
    when FalseClass
      "false"
    else
      obj.inspect
    end
  end
end

.divide(array, num) ⇒ Object

Divides the array into num chunks of the same size by placing one element in each chunk iteratively.



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# File 'lib/scout/misc/helper.rb', line 52

def self.divide(array, num)
  num = 1 if num == 0
  chunks = []
  num.to_i.times do chunks << [] end
  array.each_with_index{|e, i|
    c = i % num
    chunks[c] << e
  }
  chunks
end

.env_add(var, value, sep = ":", prepend = true) ⇒ Object 



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# File 'lib/scout/misc/system.rb', line 32

def self.env_add(var, value, sep = ":", prepend = true)
  if ENV[var].nil?
    ENV[var] = value
  elsif ENV[var] =~ /(#{sep}|^)#{Regexp.quote value}(#{sep}|$)/
    return
  else
    if prepend
      ENV[var] = value + sep + ENV[var]
    else
      ENV[var] += sep + value
    end
  end
end

.exec_time(&block) ⇒ Object 



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# File 'lib/scout/misc/monitor.rb', line 47

def self.exec_time(&block)
  start = Time.now
  eend = nil
  begin
    yield
  ensure
    eend = Time.now
  end
  eend - start
end

.fast_file_md5(file, sample = 3_000_000) ⇒ Object 



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# File 'lib/scout/misc/digest.rb', line 65

def self.fast_file_md5(file, sample = 3_000_000)
  size = File.size(file)
  sample_txt = size.to_s << ":" 
  File.open(file) do |f|
    sample_txt << f.read(sample)
    f.seek(size/2)
    sample_txt << f.read(sample)
    f.seek(size - sample - 1)
    sample_txt << f.read(sample)
  end
  Digest::MD5.hexdigest(sample_txt)
end

.file_md5(file) ⇒ Object 



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# File 'lib/scout/misc/digest.rb', line 59

def self.file_md5(file)
  file = file.find if Path === file
  file = File.expand_path(file)
  Digest::MD5.file(file).hexdigest
end

.fixascii(string) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 179

def self.fixascii(string)
  if string.respond_to?(:encode)
    self.fixutf8(string).encode("ASCII-8BIT") 
  else
    string
  end
end

.fixutf8(string) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 191

def self.fixutf8(string)
  return nil if string.nil?
  return string if string.respond_to?(:encoding) && string.encoding.to_s == "UTF-8" && (string.respond_to?(:valid_encoding?) && string.valid_encoding?) ||
                   (string.respond_to?(:valid_encoding) && string.valid_encoding)

  if string.respond_to?(:encode)
    string.encode('UTF-8', 'binary', invalid: :replace, undef: :replace, replace: '')
  else
    require 'iconv'
    @@ic ||= Iconv.new('UTF-8//IGNORE', 'UTF-8')
    @@ic.iconv(string)
  end
end

.format_definition_list(defs, indent = nil, size = nil, color = :yellow, sep = "\n\n") ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 101

def self.format_definition_list(defs, indent = nil, size = nil, color = :yellow, sep = "\n\n")
  indent ||= 30
  size ||= (Log.tty_size || MAX_TTY_LINE_WIDTH) - indent
  entries = []
  defs.each do |dt,dd|
    text = format_definition_list_item(dt,dd,indent, size,color)
    entries << text
  end
  entries * sep 
end

.format_definition_list_item(dt, dd, indent = nil, size = nil, color = :yellow) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 75

def self.format_definition_list_item(dt, dd,  indent = nil, size = nil, color = :yellow)
  if size.nil?
    base_size = MAX_TTY_LINE_WIDTH
    base_indent = indent || (base_size / 3)
    size = base_size - base_indent
  end

  indent ||= base_indent || size / 3

  dd = "" if dd.nil?
  dt = Log.color color, dt if color
  dt = dt.to_s  unless dd.empty?
  len = Log.uncolor(dt).length

  if indent < 0
    text = format_paragraph(dd, size, indent.abs-1, 0)
    text = dt << "\n" << text
  else
    offset = len - indent
    offset = 0 if offset < 0
    text = format_paragraph(dd, size, indent.abs+1, offset)
    text[0..len-1] = dt
  end
  text
end

.format_paragraph(text, size = nil, indent = nil, offset = nil) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 40

def self.format_paragraph(text, size = nil, indent = nil, offset = nil)
  size ||= Log.tty_size || MAX_TTY_LINE_WIDTH
  size = MAX_TTY_LINE_WIDTH if size > MAX_TTY_LINE_WIDTH
  indent ||= 0
  offset ||= 0

  i = 0
  size = size + offset + indent
  re = /((?:\n\s*\n\s*)|(?:\n\s*(?=\*)))/
    text.split(re).collect do |paragraph|
    i += 1
    str = if i % 2 == 1
            words = paragraph.gsub(/\s+/, "\s").split(" ")
            lines = []
            line = " "*offset
            word = words.shift
            while word
              word = word[0..size-indent-offset-4] + '...' if word.length >= size - indent - offset
              while word and Log.uncolor(line).length + Log.uncolor(word).length <= size - indent
                line << word << " "
                word = words.shift
              end
              offset = 0
              lines << ((" " * indent) << line[0..-2])
              line = ""
            end
            (lines * "\n")
          else
            paragraph
          end
    offset = 0
    str
    end*""
end

.format_seconds(time, extended = false) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 21

def self.format_seconds(time, extended = false)
  seconds = time.to_i
  str = [seconds/3600, seconds/60 % 60, seconds % 60].map{|t|  "%02i" % t }.join(':')
  str << ".%02i" % ((time - seconds) * 100) if extended
  str
end

.format_seconds_short(time) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 29

def self.format_seconds_short(time)
  if time < 0.0001
    "%.5g" % time + CHAR_SENCONDS
  elsif time < 60
    "%.2g" % time + CHAR_SENCONDS
  else
    format_seconds(time)
  end
end

.hostname ⇒ Object 



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# File 'lib/scout/misc/system.rb', line 3

def self.hostname
  @@hostname ||= begin
                   `hostname`.strip
                 end
end

.humanize(value, options = {}) ⇒ Object

source: gist.github.com/ekdevdes/2450285 author: Ethan Kramer (github.com/ekdevdes)



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# File 'lib/scout/misc/format.rb', line 137

def self.humanize(value, options = {})
  if options.empty?
    options[:format] = :sentence
  end

  values = value.to_s.split('_')
  values.each_index do |index|
    # lower case each item in array
    # Miguel Vazquez edit: Except for acronyms
    values[index].downcase! unless values[index].match(/[a-zA-Z][A-Z]/)
  end
  if options[:format] == :allcaps
    values.each do |value|
      value.capitalize!
    end

    if options.empty?
      options[:seperator] = " "
    end

    return values.join " "
  end

  if options[:format] == :class
    values.each do |value|
      value.capitalize!
    end

    return values.join ""
  end

  if options[:format] == :sentence
    values[0].capitalize! unless values[0].match(/[a-zA-Z][A-Z]/)

    return values.join " "
  end

  if options[:format] == :nocaps
    return values.join " "
  end
end

.humanize_list(list) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 205

def self.humanize_list(list)
  return "" if list.empty?
  if list.length == 1
    list.first
  else
    list[0..-2].collect{|e| e.to_s} * ", " << " and " << list[-1].to_s
  end
end

.in_dir(dir) ⇒ Object 



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# File 'lib/scout/misc/filesystem.rb', line 2

def self.in_dir(dir)
  old_pwd = FileUtils.pwd
  begin
    FileUtils.mkdir_p dir unless File.exist?(dir)
    FileUtils.cd dir
    yield
  ensure
    FileUtils.cd old_pwd
  end
end

.insist(times = 4, sleep = nil, msg = nil) ⇒ Object 



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# File 'lib/scout/misc/insist.rb', line 2

def self.insist(times = 4, sleep = nil, msg = nil)
  sleep_array = nil

  try = 0
  begin
    begin
      yield
    rescue Exception
      if Array === times
        sleep_array = times
        times = sleep_array.length
        sleep = sleep_array.shift
      end

      if sleep.nil?
        sleep_array = ([0] + [0.001, 0.01, 0.1, 0.5] * (times / 3)).sort[0..times-1]
        sleep = sleep_array.shift
      end
      raise $!
    end
  rescue TryAgain
    sleep sleep
    retry
  rescue StopInsist
    raise $!.exception
  rescue Aborted, Interrupt
    if msg
      Log.warn("Not Insisting after Aborted: #{$!.message} -- #{msg}")
    else
      Log.warn("Not Insisting after Aborted: #{$!.message}")
    end
    raise $!
  rescue Exception
    Log.exception $! if ENV["SCOUT_LOG_INSIST"] == 'true'
    if msg
      Log.warn("Insisting after exception: #{$!.class} #{$!.message} -- #{msg}")
    elsif FalseClass === msg
      nil
    else
      Log.warn("Insisting after exception:  #{$!.class} #{$!.message}")
    end

    if sleep and try > 0
      sleep sleep
      sleep = sleep_array.shift || sleep if sleep_array
    else
      Thread.pass
    end

    try += 1
    retry if try < times
    raise $!
  end
end

.intersect_sorted_arrays(a1, a2) ⇒ Object 



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# File 'lib/scout/misc/helper.rb', line 2

def self.intersect_sorted_arrays(a1, a2)
  e1, e2 = a1.shift, a2.shift
  intersect = []
  while true
    break if e1.nil? or e2.nil?
    case e1 <=> e2
    when 0
      intersect << e1
      e1, e2 = a1.shift, a2.shift
    when -1
      e1 = a1.shift while not e1.nil? and e1 < e2
    when 1
      e2 = a2.shift
      e2 = a2.shift while not e2.nil? and e2 < e1
    end
  end
  intersect
end

.log10(x) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 9

def self.log10(x)
  Math.log(x) * Log10Multiplier
end

.log2(x) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 5

def self.log2(x)
  Math.log(x) * Log2Multiplier
end

.max(list) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 13

def self.max(list)
  max = nil
  list.each do |v|
    next if v.nil?
    max = v if max.nil? or v > max
  end
  max
end

.mean(list) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 44

def self.mean(list)
  sum(list.compact.collect{|v| v.to_f } ) / list.compact.length
end

.median(array) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 48

def self.median(array)
  sorted = array.sort
  len = sorted.length
  (sorted[(len - 1) / 2] + sorted[len / 2]).to_f / 2
end

.min(list) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 22

def self.min(list)
  min = nil
  list.each do |v|
    next if v.nil?
    min = v if min.nil? or v < min
  end
  min
end

.ordered_divide(array, num) ⇒ Object

Divides the array into chunks of num same size by placing one element in each chunk iteratively.



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# File 'lib/scout/misc/helper.rb', line 65

def self.ordered_divide(array, num)
  last = array.length - 1
  chunks = []
  current = 0
  while current <= last
    next_current = [last, current + num - 1].min
    chunks << array[current..next_current]
    current = next_current + 1
  end
  chunks
end

.parse_sql_values(txt) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 214

def self.parse_sql_values(txt)
  io = StringIO.new txt.strip

  values = []
  fields = []
  current = nil
  quoted = false
  while c = io.getc
    if quoted
      if c == "'"
        quoted = false
      else
        current << c
      end
    else
      case c
      when "("
        current = ""
      when ")"
        fields << current
        values << fields
        fields = []
        current = nil
      when ','
        if not current.nil?
          fields << current
          current = ""
        end
      when "'"
        quoted = true
      when ";"
        break
      else
        current << c
      end
    end
  end
  values
end

.path_relative_to(basedir, path) ⇒ Object 



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# File 'lib/scout/misc/filesystem.rb', line 13

def self.path_relative_to(basedir, path)
  path = File.expand_path(path) unless path.slice(0,1) == "/"
  basedir = File.expand_path(basedir) unless basedir.slice(0,1) == "/"

  basedir += "/" unless basedir.slice(-2,-1) == "/"

  if path.start_with?(basedir)
    return path.slice(basedir.length, basedir.length)
  else
    return nil
  end
end

.pid_alive?(pid) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout/misc/monitor.rb', line 2

def self.pid_alive?(pid)
  return true if Process.pid == pid
  !! Process.kill(0, pid) rescue false
end

.processors ⇒ Object 



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# File 'lib/scout/misc/system.rb', line 86

def self.processors
  Etc.nprocessors
end

.profile(options = {}) ⇒ Object 



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# File 'lib/scout/misc/monitor.rb', line 29

def self.profile(options = {})
  require 'ruby-prof'
  profiler = RubyProf::Profile.new
  profiler.start
  begin
    res = yield
  rescue Exception
    puts "Profiling aborted"
    raise $!
  ensure
    result = profiler.stop
    printer = RubyProf::FlatPrinter.new(result)
    printer.print(STDOUT, options)
  end

  res
end

.proportions(array) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 86

def self.proportions(array)
  total = array.length

  proportions = Hash.new 0

  array.each do |e|
    proportions[e] += 1.0 / total
  end

  class << proportions; self; end.class_eval do
    def to_s
      sort{|a,b| a[1] == b[1] ? a[0] <=> b[0] : a[1] <=> b[1]}.collect{|k,c| "%3d\t%s" % [c, k]} * "\n"
    end
  end

  proportions
end

.sd(list) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 70

def self.sd(list)
  return nil if list.length < 3
  variance = self.variance(list)
  Math.sqrt(variance)
end

.snake_case(string) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 125

def self.snake_case(string)
  return nil if string.nil?
  string = string.to_s if Symbol === string
  string.
    gsub(/([A-Z]{2,})([A-Z][a-z])/,'\1_\2').
    gsub(/([a-z])([A-Z])/,'\1_\2').
    gsub(/\s/,'_').gsub(/[^\w]/, '').
    split("_").collect{|p| p.match(/[A-Z]{2,}/) ? p : p.downcase } * "_"
end

.softmax(array) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 110

def self.softmax(array)
	# Compute the exponentials of the input array elements
	exp_array = array.map { |x| Math.exp(x) }

	# Sum of all exponentials
	sum_exp = exp_array.sum

	# Compute the softmax values by dividing each exponential by the sum of exponentials
	softmax_array = exp_array.map { |x| x / sum_exp }

	return softmax_array
end

.std_num_vector(v, min, max) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 31

def self.std_num_vector(v, min, max)
  v_min = Misc.min(v)
  v_max = Misc.max(v)
  v_range = v_max - v_min
  range = max.to_f - min.to_f

  v.collect{|e| (e.nil? || e.nan?) ? e : min + range * (e.to_f - v_min) / v_range } 
end

.sum(list) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 40

def self.sum(list)
  list.compact.inject(0.0){|acc,e| acc += e }
end

.tarize(path, dest = nil) ⇒ Object 



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# File 'lib/scout/misc/filesystem.rb', line 26

def self.tarize(path, dest = nil)
  Misc.in_dir(path) do
    if dest
      CMD.cmd("tar cvfz '#{dest}' '.'")
    else
      CMD.cmd("tar cvfz - '.'", :pipe => true)
    end
  end
end

.timespan(str, default = "s") ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 254

def self.timespan(str, default = "s")

  return - timespan(str[1..-1], default) if str[0] == "-"

  if str.include?(":")
    seconds, minutes, hours = str.split(":").reverse
    return seconds.to_i + minutes.to_i * 60 + hours.to_i * 60 * 60
  end

  tokens = {
    "s" => (1),
    "sec" => (1),
    "m" => (60),
    "min" => (60),
    "''" => (1),
    "'" => (60),
    "h" => (60 * 60),
    "d" => (60 * 60 * 24),
    "w" => (60 * 60 * 24 * 7),
    "mo" => (60 * 60 * 24 * 31),
    "y" => (60 * 60 * 24 * 365),
  }

  tokens[nil] = tokens[default]
  tokens[""] = tokens[default]
  time = 0
  str.scan(/(\d+)(\w*)/).each do |amount, measure|
    time += amount.to_i * tokens[measure]
  end
  time
end

.to_utf8(string) ⇒ Object 



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# File 'lib/scout/misc/format.rb', line 187

def self.to_utf8(string)
  string.encode("UTF-16BE", :invalid => :replace, :undef => :replace, :replace => "?").encode('UTF-8')
end

.untar(file, target = '.') ⇒ Object 



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# File 'lib/scout/misc/filesystem.rb', line 36

def self.untar(file, target = '.')
  target = target.find if Path === target
  file = file.find if Path === file
  Misc.in_dir target do
    if IO === file
      CMD.cmd("tar xvfz -", in: file)
    else
      CMD.cmd("tar xvfz '#{file}'")
    end
  end
end

.update_git(gem_name = 'scout-essentials') ⇒ Object 



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# File 'lib/scout/misc/system.rb', line 56

def self.update_git(gem_name = 'scout-essentials')
  gem_name = 'scout-essentials' if gem_name.nil?
  dir = File.join(__dir__, '../../../../', gem_name)
  return unless Open.exist?(dir)
  Misc.in_dir dir do
    begin
      begin
        CMD.cmd_log('git pull')
      rescue
        raise "Could not update #{gem_name}"
      end

      begin
        CMD.cmd_log('git submodule update')
      rescue
        raise "Could not update #{gem_name} submodules"
      end


      begin
        CMD.cmd_log('rake install')
      rescue
        raise "Could not install updated #{gem_name}"
      end
    rescue
      Log.warn $!.message
    end
  end
end

.variance(list) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 54

def self.variance(list)
  return nil if list.length < 3
  mean = mean(list)
  list = list.compact
  list_length = list.length

  total_square_distance = 0.0
  list.each do |value|
    distance = value.to_f - mean
    total_square_distance += distance * distance
  end

  total_square_distance / (list_length - 1)
end

.wait_child(pid) ⇒ Object 



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# File 'lib/scout/misc/system.rb', line 16

def self.wait_child(pid)
  begin
    Process.waitpid2 pid.to_i
  rescue Errno::ECHILD
  end
end

.wait_for_interrupt ⇒ Object 



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# File 'lib/scout/misc/monitor.rb', line 58

def self.wait_for_interrupt
  while true
    begin
      sleep 1
    rescue Interrupt
      break
    end
  end
end

.with_env(var, value, &block) ⇒ Object 



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# File 'lib/scout/misc/system.rb', line 46

def self.with_env(var, value, &block)
  old_value = ENV[var]
  begin
    ENV[var] = value
    yield
  ensure
    ENV[var] = old_value
  end
end

.zscore(e, list) ⇒ Object 



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# File 'lib/scout/misc/math.rb', line 104

def self.zscore(e, list)
  m = Misc.mean(list)
  sd = Misc.sd(list)
  (e.to_f - m) / sd
end