[Numpy-discussion] More numpy and Numeric differences

Travis Oliphant oliphant.travis at ieee.org
Sat Feb 11 14:53:01 EST 2006

Pearu Peterson wrote:

> I have created a wiki page
>   http://scipy.org/PearuPeterson/NumpyVersusNumeric
> that reports my findings on how numpy and Numeric behave on various 
> corner cases. Travis O., could you take a look at it?
> Here is the most recent addition:
I fixed the put issue.  The problem with clip is actually in choose 
(clip is just a specific application of  choose). 

The problem is in PyArray_ConvertToCommonType.  You have an integer 
array, an integer scalar, and a floating-point scalar. 

I think the rules implemented in PyArray_ConvertToCommonType are not 
allowing the scalar to dictate anything.  But, this should clearly be 
changed to allow scalars of different "kinds" to up-cast the array.  
This would be consistent with the umath module.

So, PyArray_ConvertToCommonType needs to be improved.  This will have an 
impact on several other functions that use this C-API.


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