method

build

Ruby latest stable (v2_5_5) - 0 notes - Class: Matrix

1_8_6_287
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2_1_10 (38)
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What's this?

build(row_count, column_count = row_count) public

Creates a matrix of size row_count x column_count. 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 95
  def Matrix.build(row_count, column_count = row_count)
    row_count = CoercionHelper.coerce_to_int(row_count)
    column_count = CoercionHelper.coerce_to_int(column_count)
    raise ArgumentError if row_count < 0 || column_count < 0
    return to_enum :build, row_count, column_count unless block_given?
    rows = Array.new(row_count) do |i|
      Array.new(column_count) do |j|
        yield i, j
      end
    end
    new rows, column_count
  end

build

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