Hi everyone, I'm quite new to numpy and python either. Could someone, please, tell me what I'm doing wrong? Here goes my peace of code: def stats(filename): """Utilility to perform some basic statistics on columns.""" tab = get_textab(filename) stat_list = [ ] for row in sort_tab(tab): if row['length'] >= 15: stat_list.append(row) stat_array = np.array(stat_list) print type(sort_tab(tab)) print type(stat_array) #print stat_array.mean(axis=0) print np.mean(stat_array, axis=0) Which results in: <type 'numpy.ndarray'> <type 'numpy.ndarray'> Traceback (most recent call last): File "/home/ferreirafm/bin/cross.py", line 213, in <module> main() File "/home/ferreirafm/bin/cross.py", line 204, in main stats(filename) File "/home/ferreirafm/bin/cross.py", line 146, in stats print np.mean(stat_array, axis=0) File "/usr/lib64/python2.7/site-packages/numpy/core/fromnumeric.py", line 2374, in mean return mean(axis, dtype, out) TypeError: unsupported operand type(s) for +: 'numpy.void' and 'numpy.void' -- View this message in context: http://old.nabble.com/numpy.mean-problems-tp32945124p32945124.html Sent from the Numpy-discussion mailing list archive at Nabble.com.