# File lib/backports/1.9.2/stdlib/matrix.rb, line 185 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