Class: Matrix

Inherits:
Object
  • Object
show all
Defined in:
lib/y_petri/simulation/matrix.rb

Overview

Patches built-in Matrix class with methods that generate code for direct vector access. This is used in simulation. It is imaginable and desirable that this way of simulation be refactored, and also, a faster way of simulation provided using NMatrix class.

Direct Known Subclasses

YPetri::Simulation::MarkingVector

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.column_vector_access_code(vector: (fail ArgumentError, "No vector!"), indices: (fail ArgumentError, "No indices!")) ⇒ Object

Builds a code string for accessing the vector values at given indices.



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# File 'lib/y_petri/simulation/matrix.rb', line 14

def column_vector_access_code vector: (fail ArgumentError, "No vector!"),
                              indices: (fail ArgumentError, "No indices!")
  indices.map { |i| "#{vector}[#{i}, 0]" }.join( ", " )
end

.column_vector_assignment_code(vector: (fail ArgumentError, "No vector!"), indices: (fail ArgumentError, "No indices!"), source: (fail ArgumentError, "No source!")) ⇒ Object

Builds a code string for assigning to a vector at given indices.



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# File 'lib/y_petri/simulation/matrix.rb', line 21

def column_vector_assignment_code vector: (fail ArgumentError, "No vector!"),
                                  indices: (fail ArgumentError, "No indices!"),
                                  source: (fail ArgumentError, "No source!")
  code_lines = indices.map.with_index do |i, source_pos|
    "#{vector}.send( :[]=, #{i}, 0, #{source}.fetch( #{source_pos} ) )" if i
  end
  code_lines.compact.join( "\n" ) << "\n"
end

.column_vector_increment_by_array_code(vector: (fail ArgumentError, "No vector!"), indices: (fail ArgumentError, "No indices!"), source: (fail ArgumentError, "No source!")) ⇒ Object

Builds a code string for incrementing a vector at given indices. Source is an array.



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# File 'lib/y_petri/simulation/matrix.rb', line 46

def column_vector_increment_by_array_code vector: (fail ArgumentError, "No vector!"),
                                          indices: (fail ArgumentError, "No indices!"),
                                          source: (fail ArgumentError, "No source!")
  code_lines = indices.map.with_index do |i, source_pos|
    "#{vector}.send( :[]=, #{i}, 0, %s )" %
      "#{vector}[#{i}, 0] + #{source}[#{source_pos}]" if i
  end
  code_lines.compact.join( "\n" ) << "\n"
end

.column_vector_increment_code(vector: (fail ArgumentError, "No vector!"), indices: (fail ArgumentError, "No indices!"), source: (fail ArgumentError, "No source!")) ⇒ Object

Builds a code string for incrementing a vector at given indices. Source is a vector.



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# File 'lib/y_petri/simulation/matrix.rb', line 33

def column_vector_increment_code vector: (fail ArgumentError, "No vector!"),
                                 indices: (fail ArgumentError, "No indices!"),
                                 source: (fail ArgumentError, "No source!")
  code_lines = indices.map.with_index do |i, source_pos|
    "#{vector}.send( :[]=, #{i}, 0, %s )" %
      "#{vector}[#{i}, 0] + #{source}[#{source_pos}, 0]" if i
  end
  code_lines.compact.join( "\n" ) << "\n"
end

Instance Method Details

#assign_at_indices_closure(indices: (fail ArgumentError, "No indices!")) ⇒ Object

Builds a closure for assigning to a column at given indices.



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# File 'lib/y_petri/simulation/matrix.rb', line 69

def assign_at_indices_closure indices: (fail ArgumentError, "No indices!")
  v = self
  eval "-> ass do\n%s\nend" %
    self.class.column_vector_assignment_code( vector: ?v,
                                              indices: indices,
                                              source: "ass" )
end

#increment_at_indices_closure(indices: (fail ArgumentError, "No indices!")) ⇒ Object

Builds a closure for incrementing a column at given indices.



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# File 'lib/y_petri/simulation/matrix.rb', line 59

def increment_at_indices_closure indices: (fail ArgumentError, "No indices!")
  v = self
  eval "-> delta do\n%s\nend" %
    self.class.column_vector_increment_code( vector: "v",
                                             indices: indices,
                                             source: "delta" )
end