On Wed, Jun 29, 2011 at 1:20 PM, Lluís <xscr...@gmx.net> wrote: > Mark Wiebe writes: > > > There seems to be a general idea that masks and NA bit patterns imply > > particular differing semantics, something which I think is simply > > false. > > Well, my example contained a difference (the need for the "skipna=True" > argument) precisely because it seemed that there was some need for > different defaults. > > Honestly, I think this difference breaks the POLA (principle of least > astonishment). > > > [...] > > As far as I can tell, the only required difference between them is > > that NA bit patterns must destroy the data. Nothing else. Everything > > on top of that is a choice of API and interface mechanisms. I want > > them to behave exactly the same except for that necessary difference, > > so that it will be possible to use the *exact same Python code* with > > either approach. > > I completely agree. What I'd suggest is a global and/or per-object > "ndarray.flags.skipna" for people like me that just want to ignore these > entries without caring about setting it on each operaion (or the other > way around, depends on the default behaviour). > > The downside is that it adds yet another tweaking knob, which is not > desirable... >
One way around this would be to create an ndarray subclass which changes that default. Currently this would not be possible to do nicely, but with the _numpy_ufunc_ idea I proposed in a separate thread a while back, this could work. -Mark > > > Lluis > > -- > "And it's much the same thing with knowledge, for whenever you learn > something new, the whole world becomes that much richer." > -- The Princess of Pure Reason, as told by Norton Juster in The Phantom > Tollbooth > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion >
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