[Numpy-discussion] sum and prod
nicky van foreest
vanforeest at gmail.com
Sat Sep 8 17:56:56 EDT 2012
Hi,
I ran the following code:
args = np.array([4,8])
print np.sum( (arg > 0) for arg in args)
print np.sum([(arg > 0) for arg in args])
print np.prod( (arg > 0) for arg in args)
print np.prod([(arg > 0) for arg in args])
with this result:
2
1
<generator object <genexpr> at 0x1c70410>
1
Is the difference between prod and sum intentional? I would expect
that numpy.prod would also work on a generator, just like numpy.sum.
BTW: the last line does what I need: the product over the truth values
of all elements of args. Is there perhaps a nicer (conciser) way to
achieve this? Thanks.
Nicky
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