[Numpy-discussion] hstack(arr_Int32, arr_float32) fails because of casting rules
haase at msg.ucsf.edu
Thu Aug 24 22:59:19 CDT 2006
Travis Oliphant wrote:
> Sebastian Haase wrote:
>> On Thursday 24 August 2006 17:28, Travis Oliphant wrote:
>> Are you saying the ufunc-rules would convert "int32-float32" to float64 and
>> hence make my code "just work" !?
> Yes. That's what I'm saying (but you would get float64 out --- but if
> you didn't want that then you would have to be specific).
>> And why are there two sets of rules ?
> Because there are two modules (multiarray and umath) where the
> functionality is implemented.
>> Are the Numeric rules used at many places ?
> Not that many. I did abstract the notion to a C-API:
> PyArray_ConvertToCommonType and implemented the
> scalars-don't-cause-upcasting part of the ufunc rules in that code.
> But, I followed the old-style Numeric coercion rules for the rest of it
> (because I was adapting Numeric).
> Right now, unless there are strong objections, I'm leaning to changing
> that so that the same coercion rules are used whenever a common type is
If you mean keeping the ufunc rules (which seem more liberal, fix my
problem ;-) and might make using float32 in general more painless) - I
would be all for it ... simplifying is always good in the long term ...
> It would not be that difficult of a change.
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