[Numpy-discussion] dot and deallocation bug?

Travis Oliphant oliphant.travis at ieee.org
Mon Mar 13 23:39:01 CST 2006

Travis Oliphant wrote:
>> Hi folks,
>> I've run across an odd error in my numpy install related to numpy.dot 
>> with python lists of floats.
>> Now, I haven't updated from svn in a while (I'm currently using numpy 
>> to do some data analysis, so I'm not changing things until that's 
>> done). Perhaps someone could confirm whether this is still a bug in 
>> the current version?
>> Here's how I reproduce the error (OS X 10.4.5), python 2.4.2:
> This is a bug in the error-handling section of the optimized BLAS 
> code.  I see it too.
> The reason you don't see it for non floating point and/or higher than 
> 2-d is that the there is an optimized dot function that is taking over 
> for floating point and complex floating point code which uses the BLAS.
> So, you are exercising different sections of code.  The optimized 
> _dotblas.c file has been the source of quite a few bugs.  The slower 
> but less buggy version is always available as numpy.core.multiarray.dot
> Thanks for finding this one.


  This should be fixed in SVN now.  At least the segfault I was seeing 
disappeared.  There was a missing INCREF for a data-type descriptor.  
This would definitely cause those kinds of errors.


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