method

combine

v2_5_5 - Show latest stable - 0 notes - Class: Matrix

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combine(*matrices) public

Create a matrix by combining matrices entrywise, using the given block

x = Matrix[[6, 6], [4, 4]]
y = Matrix[[1, 2], [3, 4]]
Matrix.combine(x, y) {|a, b| a - b} # => Matrix[[5, 4], [1, 0]]

Show source

# File lib/matrix.rb, line 258
  def Matrix.combine(*matrices)
    return to_enum(__method__, *matrices) unless block_given?

    return Matrix.empty if matrices.empty?
    matrices.map!(&CoercionHelper.method(:coerce_to_matrix))
    x = matrices.first
    matrices.each do |m|
      Matrix.Raise ErrDimensionMismatch unless x.row_count == m.row_count && x.column_count == m.column_count
    end

    rows = Array.new(x.row_count) do |i|
      Array.new(x.column_count) do |j|
        yield matrices.map{|m| m[i,j]}
      end
    end
    new rows, x.column_count
  end

combine

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