method

build

v1_9_3_125 - Show latest stable - 0 notes - Class: Matrix

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build(row_size, column_size = row_size) public

Creates a matrix of size row_size x column_size. It fills the values by calling the given block, passing the current row and column. Returns an enumerator if no block is given.

m = Matrix.build(2, 4) {|row, col| col - row }
  => Matrix[[0, 1, 2, 3], [-1, 0, 1, 2]]
m = Matrix.build(3) { rand }
  => a 3x3 matrix with random elements

Show source

# File lib/matrix.rb, line 184
  def Matrix.build(row_size, column_size = row_size)
    row_size = CoercionHelper.coerce_to_int(row_size)
    column_size = CoercionHelper.coerce_to_int(column_size)
    raise ArgumentError if row_size < 0 || column_size < 0
    return to_enum :build, row_size, column_size unless block_given?
    rows = Array.new(row_size) do |i|
      Array.new(column_size) do |j|
        yield i, j
      end
    end
    new rows, column_size
  end

build

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