Hi,
I noticed the following behaviour for empty lists:
In [4]: N.median([])
---------------------------------------------------------------------------
exceptions.IndexError Traceback (most recent
call last)
/home/stefan/<ipython console>
/home/stefan/lib/python2.4/site-packages/numpy/lib/function_base.py in median(m)
1081 return sorted[index]
1082 else:
-> 1083 return (sorted[index-1]+sorted[index])/2.0
1084
1085 def trapz(y, x=None, dx=1.0, axis=-1):
IndexError: index out of bounds
In [5]: N.mean([])
Out[5]: nan
In [6]: N.average([])
---------------------------------------------------------------------------
exceptions.ZeroDivisionError Traceback (most recent
call last)
/home/stefan/<ipython console>
/home/stefan/lib/python2.4/site-packages/numpy/lib/function_base.py in
average(a, axis, weights, returned)
294 if not isinstance(d, ndarray):
295 if d == 0.0:
--> 296 raise ZeroDivisionError, 'zero denominator in average()'
297 if returned:
298 return n/d, d
ZeroDivisionError: zero denominator in average()
Which is the ideal response -- NaN or an exception, and if an exception,
of which kind?
Cheers
Stéfan
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