method

hstack

v2_4_6 - Show latest stable - 0 notes - Class: Matrix

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hstack(x, *matrices) public

Create a matrix by stacking matrices horizontally

x = Matrix[[1, 2], [3, 4]]
y = Matrix[[5, 6], [7, 8]]
Matrix.hstack(x, y) # => Matrix[[1, 2, 5, 6], [3, 4, 7, 8]]

Show source

# File lib/matrix.rb, line 336
  def Matrix.hstack(x, *matrices)
    raise TypeError, "Expected a Matrix, got a #{x.class}" unless x.is_a?(Matrix)
    result = x.send(:rows).map(&:dup)
    total_column_count = x.column_count
    matrices.each do |m|
      raise TypeError, "Expected a Matrix, got a #{m.class}" unless m.is_a?(Matrix)
      if m.row_count != x.row_count
        raise ErrDimensionMismatch, "The given matrices must have #{x.row_count} rows, but one has #{m.row_count}"
      end
      result.each_with_index do |row, i|
        row.concat m.send(:rows)[i]
      end
      total_column_count += m.column_count
    end
    new result, total_column_count
  end

hstack

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