[Numpy-discussion] bug triggered by array.astype()

Travis Oliphant oliphant.travis at ieee.org
Sun Jan 29 00:52:01 CST 2006


Gerard Vermeulen wrote:

>>>>from numpy import *
>>>>core.__version__
>>>>        
>>>>
>'0.9.5.2019'
>  
>
>>>>v = linspace(0, 2*pi)
>>>>c = (255<<24)*cos(v) + (255<<16)*cos(v+2*pi/3) + (255<<8)*cos(v+4*pi/3) + 255
>>>>c.astype(UInt32)
>>>>        
>>>>
>Traceback (most recent call last):
>  File "<stdin>", line 1, in ?
>SystemError: Objects/longobject.c:257: bad argument to internal function
>  
>
>
>  
>
In SVN, now a Overflow error is raised instead in this example because 
negative long integer objects are trying to be converted to unsigned 
integers (this is a Python error being raised).  We could check for this 
and instead do what the c-compiler would do in converting from signed to 
unsigned objects. 

Is that preferrable?

-Travis





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