Thanks, I updated the page. Charles R Harris wrote: > > > On Jan 4, 2008 12:27 PM, Andrew Straw <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > I have added a page to the wiki describing this issue: > > http://scipy.org/numpy_warts_and_gotchas > > I'll link it into the main documentation pages over the next few > days, > but I ask for a review the following text for correctness and clarity: > (You can simply edit the wiki page or post your reply here and > I'll do it.) > > Like most of numpy, allclose() uses the broadcasting rules when > performing its operation. This leads to the following behavior: > > >>> a=32 > >>> b=numpy.array([]) > >>> numpy.allclose(a,b) > True > > Upon closer inspection, we can see that the broadcasting rules > cause a > to become a zero-dimensional array like b. The default truth value > of a > > > It is not the dimensions, it's the fact that the array is empty, so > that anything said about it's non-existent elements is true, i.e., x > in empty -> anything is always true because x in empty is always > false. So we also have the following: > > In [1]: allclose(32,[[]]) > Out[1]: True > > The other reason is that because of broadcasting, the shape of the > arrays may be immaterial. > > Chuck > > ------------------------------------------------------------------------ > > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion >
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