[Numpy-discussion] Can't get ufunc to work for integers

John Salvatier jsalvati@u.washington....
Thu Jul 22 11:25:54 CDT 2010


Oh, ok. That makes sense. Thanks for the speedy help.

John

On Thu, Jul 22, 2010 at 9:14 AM, Pauli Virtanen <pav@iki.fi> wrote:

> Thu, 22 Jul 2010 08:49:09 -0700, John Salvatier wrote:
> > I am trying to learn how to create ufuncs, and I got a ufunc to compile
> > correctly with the signature int -> double, but I can't get it to accept
> > any arguments. My function is testfunc and I used NPY_INT as the first
> > signature and NPY_DOUBLE as the second signature. What should I look at
> > to figure this out?
>
> I think you need to specify NPY_LONG instead of NPY_INT -- the NPY_INT is
> IIRC sort of a "virtual type" that you can use when creating arrays, but
> no array is ever of type NPY_INT, since it maps to either NPY_LONG or
> whatever the C "int" type happens to be.
>
> Maybe someone can correct me here, but AFAIK it goes like so.
>
> --
> Pauli Virtanen
>
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