In what way does it not work? Does it error out at the `arr = arr[mask]` step? Or is it that something unexpected happens?
I am guessing that you are trying to mutate the px, py, pz, w, x, y, z arrays? If so, that for-loop won't do it. In python, a plain simple assignment merely makes the variable point to a different object. It doesn't mutate the object itself. Cheers! Ben Root On Fri, Oct 27, 2017 at 11:43 AM, Andrei Berceanu <berce...@runbox.com> wrote: > Hmm, so how come this doesn't work now? > > mask = ((px > 2.) & ((py**2 + pz**2) / px**2 < 1.)) > > for arr in (px, py, pz, w, x, y, z): > arr = arr[mask] > > On Mon, 23 Oct 2017 15:05:26 +0200 (CEST), "Andrei Berceanu" < > berce...@runbox.com> wrote: > > > Thank you so much, the solution was much simpler than I expected! > > > > On Sat, 21 Oct 2017 23:04:43 +0200, Daπid <davidmen...@gmail.com> wrote: > > > > > On 21 October 2017 at 22:32, Eric Wieser <wieser.eric+nu...@gmail.com> > > > wrote: > > > > > > > David, that doesn’t work, because np.cumsum(mask)[mask] is always > equal > > > > to np.arange(mask.sum()) + 1. Robert’s answer is correct. > > > > > > > Of course, you are right. It makes sense in my head now. > > > _______________________________________________ > > > NumPy-Discussion mailing list > > > NumPy-Discussion@python.org > > > https://mail.python.org/mailman/listinfo/numpy-discussion > > > > > > _______________________________________________ > > NumPy-Discussion mailing list > > NumPy-Discussion@python.org > > https://mail.python.org/mailman/listinfo/numpy-discussion > > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@python.org > https://mail.python.org/mailman/listinfo/numpy-discussion >
_______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@python.org https://mail.python.org/mailman/listinfo/numpy-discussion
