# File lib/extras/as_rectarray.rb, line 20
        def flipRows!
                (@rows/2).times do|i|
                        for j in 0...@cols do
                                a = index(i,j)
                                b = index(@rows - 1 - i,j)
                                temp = @arr[a]
                                @arr[a] = @arr[b]
                                @arr[b] = temp
                        end
                end
        end