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MyASPN >> Mail Archive >> numpy-discussion
numpy-discussion
Re: [Numpy-discussion] can't resize ndarray subclass
by Travis Oliphant other posts by this author
Feb 28 2006 1:25PM messages near this date
Re: [Numpy-discussion] can't resize ndarray subclass | Re: [Numpy-discussion] can't resize ndarray subclass
Zachary Pincus wrote:

>  However a new problem has me nearly tearing my hair out. Calling the  
>  resize method on an instance of such a subclass works fine. However,  
>  calling a method that calls 'self.resize' breaks! And worse, it  
>  breaks in such a way that then subsequent calls to resize also break.


In SVN version of numpy, there is a new keyword argument to resize 
(refcheck).  If this keyword argument is 0 (it defaults to 1), the 
reference-count check is not performed.  Thus, if you are sure that your 
array has not exposed it's memory to another object, then you can set 
refcheck=0 and the resize will proceed.

If you really did expose your memory to another object, this could lead 
to segfaults in exactly the same way that exposing the memory to a 
Python array (array module) and then later resizing (which Python 
currently allows) would cause problems.

Be careful...

-Travis





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Zachary Pincus
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