[Numpy-discussion] Sorting objects with ndarrays
Pauli Virtanen
pav at iki.fi
Sun Feb 28 06:05:15 EST 2010
su, 2010-02-28 kello 10:25 +0100, Gael Varoquaux kirjoitti:
[clip]
> The problem is that ndarrays cannot be compared. So I have tried to
> override the 'cmp' in the 'sorted' function, however I am comparing
> fairly complex objects, and I am having a hard time predicting wich
> member of the object will contain the array.
I don't understand what "predicting which member of the object" means?
Do you mean that in the array, you have classes that contain ndarrays as
their attributes, and the classes have __cmp__ implemented?
If not, can you tell why
def xcmp(a, b):
a_nd = isinstance(a, ndarray)
b_nd = isinstance(b, ndarray)
if a_nd and b_nd:
pass # compare ndarrays in some way
elif a_nd:
return 1 # sort ndarrays first
elif b_nd:
return -1 # sort ndarrays first
else:
return cmp(a, b) # ordinary compare
does not work?
Cheers,
Pauli
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