# File lib/graphviz/math/matrix.rb, line 50 def [](line, column) unless (0...@line).to_a.include?(line-1) raise CoordinateError, "Line out of range (#{line} for 1..#{@line})!" end unless (0...@column).to_a.include?(column-1) raise CoordinateError, "Column out of range (#{column} for 1..#{@column})!" end @matrix[line-1][column-1] end