Hi, please take a look at this:

...

...

na.sum( na.zeros((2,6)) ) [0 0 0 0 0 0] na.sum( na.zeros((2,6)) , 0) [0 0 0 0 0 0] na.sum( na.zeros((2,6)) , 1) [0 0] na.sum( na.zeros((2,6)) , 2) [0 0] na.sum( na.zeros((2,6)) , 3) [0 0] na.sum( na.zeros((2,6)) , 4) [0 0] na.sum( na.zeros((2,6)) , -1) [0 0] na.sum( na.zeros((2,6)) , -2) [0 0 0 0 0 0] na.sum( na.zeros((2,6)) , -3) [0 0] na.sum( na.zeros((2,6)) , -4) [0 0]

I think here should be a ValueError exception thrown rather than defaulting to the '-1'-axis. Comments ? Thanks, Sebastian Haase