On Tue, Jan 13, 2015 at 7:23 AM, Benjamin Root <[email protected]> wrote:
> Oh, wow. I never noticed that before. Yeah, if I state that retstep=True, > then I am coding my handling to expect two values to be returned, not 1. I > think it should be nan, but I could also agree with zero. It should > definitely remain a float value, though. > NaN it is then: the change and supporting tests are now part of gh-5446. Jaime > > Cheers! > Ben Root > > On Tue, Jan 13, 2015 at 10:15 AM, Jaime Fernández del Río < > [email protected]> wrote: > >> While working on something else, I realized that linspace is not handling >> requests for returning the sampling spacing consistently: >> >> >>> np.linspace(0, 1, 3, retstep=True) >> (array([ 0. , 0.5, 1. ]), 0.5) >> >>> np.linspace(0, 1, 1, retstep=True) >> array([ 0.]) >> >>> np.linspace(0, 1, 0, retstep=True) >> array([], dtype=float64) >> >> Basically, retstep is ignored if the number of samples is 0 or 1. One >> could argue that it makes sense, because those sequences do not have a >> spacing defined. But at the very least it should be documented as doing so, >> and the following inconsistency removed: >> >> >>> np.linspace(0, 1, 1, endpoint=True, retstep=True) >> array([ 0.]) >> >>> np.linspace(0, 1, 1, endpoint=False, retstep=True) >> (array([ 0.]), 1.0) >> >> I am personally inclined to think that if a step is requested, then a >> step should be returned, and if it cannot be calculated in a reasonable >> manner, then a placeholder such as None, nan, 0 or stop - start should be >> returned. >> >> What does the collective wisdom think is the best approach for this? >> >> Jaime >> >> -- >> (\__/) >> ( O.o) >> ( > <) Este es Conejo. Copia a Conejo en tu firma y ayúdale en sus planes >> de dominación mundial. >> >> _______________________________________________ >> NumPy-Discussion mailing list >> [email protected] >> http://mail.scipy.org/mailman/listinfo/numpy-discussion >> >> > > _______________________________________________ > NumPy-Discussion mailing list > [email protected] > http://mail.scipy.org/mailman/listinfo/numpy-discussion > > -- (\__/) ( O.o) ( > <) Este es Conejo. Copia a Conejo en tu firma y ayúdale en sus planes de dominación mundial.
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