On Wed, Feb 4, 2009 at 11:19 AM, Pierre GM <pgmdevl...@gmail.com> wrote: > > On Feb 4, 2009, at 11:00 AM, josef.p...@gmail.com wrote: > >> I just had a hard to find bug in my program. poly1d treats numpy >> scalars differently than python numbers when left or right >> multiplication is used. >> >> Essentially, if the first term is the numpy scalar, multiplied by a >> polynomial, then the result is an np.array. >> If the order is reversed, then the result is an instance of np.poly1d. >> The return types are also the same for numpy arrays, which is at least >> understandable, although a warning would be good) >> >> When using plain (python) numbers, then both left and right >> multiplication of the number with the polynomial returns a polynomial. >> >> Is this a bug or a feature? I didn't see it mentioned in the docs. > > Looks like yet another example of ticket #826: > http://scipy.org/scipy/numpy/ticket/826 > This one is getting quite a problem, and I have no idea how to fix > it...
Thanks, yes it looks exactly like this ticket. At least, once I know about it, it is not too difficult to work around, but it costs a lot of debugging time to figure this out. Josef _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
