[Numpy-discussion] Binary ufuncs: minimum
Charles R Harris
Tue May 27 18:34:46 CDT 2008
On Tue, May 27, 2008 at 5:27 PM, Nathan Bell <firstname.lastname@example.org> wrote:
> On Tue, May 27, 2008 at 5:39 PM, Christopher Barker
> <Chris.Barker@noaa.gov> wrote:
> > I'm not so sure. I know I wouldn't expect to get a different type back
> > with a call to abs(). Do we really want to change that expectation just
> > for the case of MIN_INT?
> > While everyone is going to want an unsigned value when calling abs(),
> > who knows if they might want to use negative numbers later? Like:
> > x = abs(x)
> > x *= -1
> > Now what do we get/want?
> IMO abs() returning non-negative numbers is a more fundamental
> property. In-place operations on integer arrays are somewhat
> dangerous, and best left to more sophisticated users anyway.
> Interestingly, MATLAB (v7.5.0) takes a different approach:
> >> A = int8([ -128, 1])
> A =
> -128 1
> >> abs(A)
> ans =
> 127 1
> >> -A
> ans =
> 127 -1
Oooh, talk about compromises...
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