[Scipy-tickets] [SciPy] #1606: large array causes savemat to produce a "corrupt" file

SciPy Trac scipy-tickets@scipy....
Wed Feb 22 12:32:06 CST 2012


#1606: large array causes savemat to produce a  "corrupt" file
--------------------------------+-------------------------------------------
 Reporter:  david.warde-farley  |       Owner:  somebody   
     Type:  defect              |      Status:  new        
 Priority:  normal              |   Milestone:  Unscheduled
Component:  scipy.io            |     Version:  0.9.0      
 Keywords:  matlab, savemat     |  
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Changes (by warren.weckesser):

  * keywords:  matlab => matlab, savemat


Comment:

 Replying to [ticket:1606 david.warde-farley]:
 >
 > This smells like it may be a deficiency in the MATLAB v5 format itself,
 but if so this save should not ostensibly succeed on the Python end.

 I think you are right.  According to
 www.mathworks.com/help/pdf_doc/matlab/matfile_format.pdf, the header for
 each data element includes the number of bytes in the element, and this
 value is stored in a 32 bit field.  The number of bytes in your array
 exceeds 2**32-1.

 If this is, in fact, the problem, savemat should raise an exception when
 the number of bytes in an array won't find in a 32 bit integer.

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1606#comment:1>
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