[SciPy-user] illegal instruction error in scipy.linalg.decomp.svd

Lev Givon lev@columbia....
Fri Jan 4 10:44:11 CST 2008


Received from Lev Givon on Mon, Dec 17, 2007 at 07:38:18PM EST:
> On a Pentium 4 Linux box running python 2.5.1, scipy 0.6.0, numpy
> 1.0.4, and lapack 3.0, I recently noticed that
> scipy.linalg.decomp.svd() fails (and causes python to crash) with an
> "illegal instruction" error. A bit of debugging revealed that the
> error occurs in the line
> 
> lwork = calc_lwork.gesdd(gesdd.prefix,m,n,compute_uv)[1]
> 
> in scipy/linalg/decomp.py. Interestingly, scipy 0.5.2.1 on the same
> box (with all of the other software packages unchanged) does not
> exhibit this problem. Moreover, when I install scipy 0.6.0 along with
> all of the other packages on a Linux machine containing a Pentium D
> CPU, I do not observe the problem either.
> 
> Being that I am running Mandriva Linux, closed scipy bug 540 caught my
> eye. I'm not sure how it could be related to the above problem, though
> (and I also do not know what the lapack patch mentioned in the ticket
> could have been - even though I have been maintaining Mandriva's
> lapack lately :-).
> 
> Thoughts?

This problem is also present in the latest svn release of scipy (3781).

     	     	     	     	    	       	       L.G.


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