# File narray_ext.rb, line 265 def rot90(n_times=1) if self.rank < 2 raise "must be >= 2 dimensional array" end case n_times%4 when 0 self.dup when 1 self.transpose(1,0).reverse(0) when 2 self.reverse(0,1) when 3 self.transpose(1,0).reverse(1) end end