[Python-ideas] Extremely weird itertools.permutations

[Neil Girdhar]

Actually I didn't notice that.  It seems weird to find erf in math, but erf
for complex numbers in scipy.special.  It's just about organization and
user discovery.  I realize that from the developer's point of view, erf for
complex numbers is complicated, but why does the user care?




On Mon, Oct 14, 2013 at 8:29 AM, Mark Dickinson <dickinsm at gmail.com> wrote:

> On Sun, Oct 13, 2013 at 9:56 PM, Neil Girdhar <mistersheik at gmail.com>wrote:
>
>>
>> By complete I meant that just as if you were to add the "error function,
>> erf" to math, you would want to add an equivalent version to cmath.
>>
>
> An interesting choice of example.  *Why* would you want to do so?
>
> Since you bring this up, I assume you're already aware that math.erf
> exists but cmath.erf does not.  I believe there are good, practical reasons
> *not* to add cmath.erf, in spite of the existence of math.erf.  Not least
> of these is that cmath.erf would be significantly more complicated to
> implement and of significantly less interest to users.  And perhaps there's
> a parallel with itertools.permutations and the proposed
> itertools.multiset_permutations here...
>
> --
> Mark
>
>
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