[Numpy-discussion] numpy.all docstring reality check

David Goldsmith d.l.goldsmith@gmail....
Tue Jun 29 21:38:39 CDT 2010


OK, now I understand: dtype(out) is preserved, whatever that happens to be,
not dtype(a) (which is what I thought it meant) - I better clarify.  Thanks!

DG

On Tue, Jun 29, 2010 at 7:28 PM, Skipper Seabold <jsseabold@gmail.com>wrote:

> On Tue, Jun 29, 2010 at 8:50 PM, David Goldsmith
> <d.l.goldsmith@gmail.com> wrote:
> > Hi, folks.  Under Parameters, the docstring for
> numpy.core.fromnumeric.all
> > says:
> >
> > "out : ndarray, optionalAlternative output array in which to place the
> > result. It must have the same shape as the expected output and the type
> is
> > preserved." [emphasis added].I assume this is a
> > copy-and-paste-from-another-docstring "typo" (shouldn't it be (possibly
> > ndarray of) bool), but I just wanted to double check.
> >
>
> Looks right to me though there is no
>
> In [255]: a = np.ones(10)
>
> In [256]: b = np.empty(1,dtype=int)
>
> In [257]: np.core.fromnumeric.all(a,out=b)
> Out[257]: array([1])
>
> In [258]: b.dtype
> Out[258]: dtype('int64')
>
> In [259]: b = np.empty(1,dtype=bool)
>
> In [260]: np.core.fromnumeric.all(a,out=b)
> Out[260]: array([ True], dtype=bool)
>
> In [261]: b.dtype
> Out[261]: dtype('bool')
>
> In [262]: b = np.empty(1)
>
> In [263]: np.core.fromnumeric.all(a,out=b)
> Out[263]: array([ 1.])
>
> In [264]: b.dtype
> Out[264]: dtype('float64')
>
> In [265]: a2 =
> np.column_stack((np.ones(10),np.ones(10),np.random.randint(0,2,10)))
>
> In [266]: b = np.empty(3,dtype=int)
>
> In [267]: np.core.fromnumeric.all(a2,axis=0,out=b)
> Out[267]: array([1, 1, 0])
>
> In [268]: b.dtype
> Out[268]: dtype('int64')
>
> This is interesting
>
> In [300]: b = np.ones(3,dtype='a3')
>
> In [301]: np.core.fromnumeric.all(a2,axis=0,out=b)
> Out[301]:
> array(['Tru', 'Tru', 'Fal'],
>      dtype='|S3')
>
> Skipper
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>



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