[Numpy-discussion] NumPy/SciPy LAPACK version
Kevin Jacobs <jacobs@bioinformed.com>
bioinformed at gmail.com
Mon Jul 16 09:52:25 EDT 2007
Hi all,
This is a bit of a SciPy question, but I thought I'd ask here since I'm
already subscribed. I'd like to add some new LAPACK bindings to SciPy and
was wondering if there was a minimum version requirement for LAPACK, since
it would be ideal if I could use some of the newer 3.0 features. In
addition to using some block methods only added in 3.0, it is very
convenient to use the WORK=-1 for space queries instead of reimplementing
the underlying logic in the calc_work module.
The routines of most interest to me are:
DGELSD
DGGGLM
DGGLSE
I've also found that SciPy's sqrtm is broken:
>>> a=matrix([[59, 64, 69],
[64, 72, 80],
[69, 80, 91]])
>>> sqrtm(a)
array([[ 5.0084801 +1.03420519e-08j, 4.40747825 -2.06841037e-08j,
3.8064764 +1.03420519e-08j],
[ 4.40747825 -2.06841037e-08j, 4.88353492 +4.13682075e-08j,
5.3595916 -2.06841037e-08j],
[ 3.8064764 +1.03420519e-08j, 5.3595916 -2.06841037e-08j,
6.9127068 +1.03420519e-08j]])
>>> sqrtm(a)*sqrtm(a)
array([[ 25.08487289 +1.03595922e-07j, 19.42586452 -1.82329475e-07j,
14.48926259 +7.87335527e-08j],
[ 19.42586452 -1.82329475e-07j, 23.84891336 +4.04046172e-07j,
28.72522212 -2.21716697e-07j],
[ 14.48926259 +7.87335527e-08j, 28.72522212 -2.21716697e-07j,
47.78551529 +1.42983144e-07j]])
So not even close... (and yes, it does deserve a bug report if one doesn't
already exist)
-Kevin
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