Class: GraphViz::Math::Matrix

Inherits:
Object
  • Object
show all
Defined in:
lib/graphviz/math/matrix.rb

Instance Method Summary collapse

Constructor Details

#initialize(line_or_array, column = 0, val = 0) ⇒ Matrix

Returns a new instance of Matrix.



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# File 'lib/graphviz/math/matrix.rb', line 13

def initialize( line_or_array, column = 0, val = 0 )
  if line_or_array.kind_of?(Array)
    line = line_or_array.size
    column = nil
    line_or_array.size.times do |l|
      unless line_or_array[l].kind_of?(Array)
        raise ArgumentError, "Wrong matrix definition"
      end
      column = line_or_array[l].size if column.nil?
      unless line_or_array[l].size == column
        raise ArgumentError, "Wrong matrix definition"
      end
      line_or_array[l].size.times do |c|
        unless line_or_array[l][c].kind_of?(Numeric)
          raise ValueError, "Element at [#{l+1}, #{c+1}] is not a number"
        end
      end
    end

    @matrix = line_or_array
    @line = line
    @column = column
  elsif line_or_array.kind_of?(Integer) and column > 0
    @matrix = Array.new(line_or_array)
    @matrix.size.times do |l|
      @matrix[l] = Array.new(column)
      @matrix[l].size.times do |c|
        @matrix[l][c] = val
      end
    end
    @line = line_or_array
    @column = column
  else
    raise ArgumentError, "Wrong matrix definition"
  end
end

Instance Method Details

#*(m) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 106

def *(m)
  matrix = GraphViz::Math::Matrix.new( @line, @line )

  @line.times do |line|
    @line.times do |column|
      l = self.line(line+1)
      c = m.column(column+1)
      v = 0
      l.size.times do |i|
        v += l[i]*c[i]
      end
      matrix[line+1,column+1] = v
    end
  end

  return matrix
end

#-(m) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 96

def -(m)
  matrix = GraphViz::Math::Matrix.new( @line, @column )
  @line.times do |line|
    @column.times do |column|
      matrix[line+1, column+1] = self[line+1, column+1] - m[line+1, column+1]
    end
  end
  return matrix
end

#==(m) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 153

def ==(m)
  equal = true
  @line.times do |line|
    @column.times do |column|
      equal &&= (m[line+1, column+1] == self[line+1, column+1])
    end
  end
  return equal
end

#[](line, column) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 50

def [](line, column)
  unless (0...@line).to_a.include?(line-1)
    raise CoordinateError, "Line out of range (#{line} for 1..#{@line})!"
  end
  unless (0...@column).to_a.include?(column-1)
    raise CoordinateError, "Column out of range (#{column} for 1..#{@column})!"
  end
  @matrix[line-1][column-1]
end

#[]=(line, column, val) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 60

def []=( line, column, val )
  unless (0...@line).to_a.include?(line-1)
    raise CoordinateError, "Line out of range (#{line} for 1..#{@line})!"
  end
  unless (0...@column).to_a.include?(column-1)
    raise CoordinateError, "Column out of range (#{column} for 1..#{@column})!"
  end
  @matrix[line-1][column-1] = val
end

#column(column) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 131

def column( column )
  col = []
  unless (0...@column).to_a.include?(column-1)
    raise CoordinateError, "Column out of range (#{column} for 1..#{@column})!"
  end
  @line.times do |line|
    col << self[line+1, column]
  end

  return col
end

#columns ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 75

def columns
  @column
end

#line(line) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 124

def line( line )
  unless (0...@line).to_a.include?(line-1)
    raise CoordinateError, "Line out of range (#{line} for 1..#{@line})!"
  end
  @matrix[line-1]
end

#lines ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 79

def lines
  @line
end

#matrix ⇒ Object Also known as: to_a 



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# File 'lib/graphviz/math/matrix.rb', line 70

def matrix
  @matrix
end

#remove_column(n) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 180

def remove_column(n)
  unless (0...@column).to_a.include?(n-1)
    raise CoordinateError, "Column out of range (#{n} for 1..#{@column})!"
  end

  matrix = GraphViz::Math::Matrix.new( @line, @column - 1 )
  @line.times do |line|
    ncolumn = 0
    @column.times do |column|
      next if column == n - 1
      matrix[line+1, ncolumn+1] = self[line+1, column+1]
      ncolumn += 1
    end
  end
  return matrix
end

#remove_line(n) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 163

def remove_line(n)
  unless (0...@line).to_a.include?(n-1)
    raise CoordinateError, "Line out of range (#{n} for 1..#{@line})!"
  end

  matrix = GraphViz::Math::Matrix.new( @line - 1, @column )
  nline = 0
  @line.times do |line|
    next if line == n - 1
    @column.times do |column|
      matrix[nline+1, column+1] = self[line+1, column+1]
    end
    nline += 1
  end
  return matrix
end

#set_matrix(m) ⇒ Object

:nodoc:



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# File 'lib/graphviz/math/matrix.rb', line 205

def set_matrix(m) #:nodoc:
  @matrix = m
end

#sum_of_column(n) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 197

def sum_of_column(n)
  column(n).inject(0){|sum,item| sum + item}
end

#sum_of_line(n) ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 201

def sum_of_line(n)
  line(n).inject(0){|sum,item| sum + item}
end

#to_s ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 83

def to_s
  size = bigger
  out = ""
  @line.times do |line|
    out << "["
    @column.times do |column|
      out << sprintf(" %1$*2$s", @matrix[line][column].to_s, size)
    end
    out << "]\n"
  end
  return out
end

#transpose ⇒ Object 



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# File 'lib/graphviz/math/matrix.rb', line 143

def transpose
  matrix = GraphViz::Math::Matrix.new( @column, @line )
  @line.times do |line|
    @column.times do |column|
      matrix[column+1, line+1] = self[line+1, column+1]
    end
  end
  return matrix
end