On 9 September 2012 00:10, Warren Weckesser <warren.weckesser@enthought.com> wrote:

On Sat, Sep 8, 2012 at 4:56 PM, nicky van foreest <vanforeest@gmail.com> wrote:

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

I get 2 here, not 1 (numpy version 1.6.1).

Sorry. Typo.

<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.

Whatever the correct result may be, I would expect them to have the same behavior with respect to a generator argument.

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.

How about:

In [15]: np.all(args > 0) Out[15]: True

Warren

Nicky

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