# [Numpy-discussion] numpy.mean problems

ferreirafm ferreirafm at lim12.fm.usp.br
Fri Dec 9 14:47:50 EST 2011

```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'
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```