[Numpy-discussion] Useless but tricky exercise

2016-11-03 Thread Nicolas P. Rougier 

Hi all,

Given an array V that is a view of a base B, I was wondering if it is possible
to find a (string) index such that `V = B[index]`

For example:

```
B = np.arange(8*8).reshape(8,8)
V = B[::2,::2]

index = find_view(B,V)
print(index)
"::2,::2"

print(np.allclose(V, eval("B[%s]" % index)))
True
```


I wrote a solution at 
https://gist.github.com/rougier/b8c2256434b3a4a4271260cd4cc6cbc7 
(not very thoroughly tested) but maybe there are better ways to do that (like a 
magic numpy call ?)


(no use-case at all, only for teaching)


Nicolas

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[Numpy-discussion] Branching NumPy 1.12.x

2016-11-03 Thread Charles R Harris 
Hi All,

I'm thinking that it is time to branch NumPy 1.12.x. I haven't got
everything in it that I would have liked, in particular __numpy_ufunc__,
but I think there is plenty of material and not branching is holding up
some of the more risky stuff.  My current thoughts on __numpy_ufunc__ is
that it would be best to work it out over the 1.13.0 release cycle,
starting with enabling it again right after the branch. Julian's work on
avoiding temporary copies and Pauli's overlap handling PR are two other
changes I've been putting off but don't want to delay further. There are
some other smaller things that I had scheduled for 1.12.0, but would like
to spend more time looking at. If there are some things that you think just
have to be in 1.12.0, please mention them, but I'd rather aim at getting
1.13.0 out in a timely manner.

Thoughts?

Chuck
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Re: [Numpy-discussion] Using numpy.rint() with scalars

2016-11-03 Thread Charles R Harris 
On Thu, Nov 3, 2016 at 9:17 AM, Yuri Sukhov  wrote:

> Hi all,
>
> According to the documentation for numpy.rint() (
> https://docs.scipy.org/doc/numpy/reference/generated/numpy.rint.html),
> it's a ufunc that accepts an array-like object as an input.
>
> But it also works with scalar inputs. Could anyone clarify if such use
> case is considered to be common and acceptable? It it just the
> documentation that does not cover one of the possible scenarios, or is it a
> side effect and such use case should be avoided?
>
> I want to use rint() with scalars as I have not found an alternative with
> the same behavior in cPython, but if it's not how it should be used, I
> don't want to rewrite the app when that behavior will change.
>
>
Scalars are array_like, they can be converted to arrays.

Chuck
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[Numpy-discussion] Using numpy.rint() with scalars

2016-11-03 Thread Yuri Sukhov 
Hi all,

According to the documentation for numpy.rint() (https://docs.scipy.org/doc/
numpy/reference/generated/numpy.rint.html), it's a ufunc that accepts an
array-like object as an input.

But it also works with scalar inputs. Could anyone clarify if such use case
is considered to be common and acceptable? It it just the documentation
that does not cover one of the possible scenarios, or is it a side effect
and such use case should be avoided?

I want to use rint() with scalars as I have not found an alternative with
the same behavior in cPython, but if it's not how it should be used, I
don't want to rewrite the app when that behavior will change.

Thanks!

Yuri.
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Re: [Numpy-discussion] missing from contributor list?

2016-11-03 Thread Julian Taylor 
you can add multiple email addresses to your github settings so commits 
are properly attributed to your account.



On 11/03/2016 11:10 AM, m...@telenczuk.pl wrote:

Hi,

I had the same problem when I changed my email address. It seems that github 
matches user profiles to commits using the email address, so you have to make 
sure that the email you sign your commits with is registered in your github 
account.

Cheers,

Bartosz

Charles R Harris wrote:

On Wed, Nov 2, 2016 at 4:38 PM, Sturla Molden 
wrote:


Why am I missing from the contributor hist here?

https://github.com/numpy/numpy/blob/master/numpy/_
build_utils/src/apple_sgemv_fix.c




You still show up in the commit log of if you follow the file
```
git log --follow numpy/_build_utils/apple_accelerate.py
```

So I have to agree with others that the problem is on the github end.

Chuck



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Re: [Numpy-discussion] missing from contributor list?

2016-11-03 Thread mail 
Hi,

I had the same problem when I changed my email address. It seems that github 
matches user profiles to commits using the email address, so you have to make 
sure that the email you sign your commits with is registered in your github 
account.

Cheers,

Bartosz

Charles R Harris wrote:
> On Wed, Nov 2, 2016 at 4:38 PM, Sturla Molden 
> wrote:
> 
> > Why am I missing from the contributor hist here?
> >
> > https://github.com/numpy/numpy/blob/master/numpy/_
> > build_utils/src/apple_sgemv_fix.c
> >
> >
> >
> You still show up in the commit log of if you follow the file
> ```
> git log --follow numpy/_build_utils/apple_accelerate.py
> ```
> 
> So I have to agree with others that the problem is on the github end.
> 
> Chuck


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