[EMAIL PROTECTED] wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Aug 27, 2006, at 4:19 PM, numpy-discussion- > [EMAIL PROTECTED] wrote: > >>> It seems like numpy.sum breaks generator expressions: >>> >>> In [1]: sum(i*i for i in range(10)) >>> Out[1]: 285 >>> >>> In [2]: from numpy import sum >>> >>> In [3]: sum(i*i for i in range(10)) >>> Out[3]: <generator object at 0x10eca58> >>> >>> Is this intentional? If so, how do I get the behaviour that I am >>> after? >>> >> >> In [3]: sum([i*i for i in range(10)]) >> Out[3]: 285 > > Well, thats a list comprehension, not a generator expression. I was > after the latter because it is more efficient.
Not really. Any numpy functions that would automatically create an array from an __len__-less iterator will have to convert it to a list first. That said, some cases for numpy.sum() might be handled by passing the argument to __builtin__.sum(), but it might be tricky devising a robust rule for when that happens. Consequently, I would like to avoid doing so. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
