[SciPy-user] Disable ATLAS

Nils Wagner dr.nwagner at web.de
Sat Feb 21 18:32:15 CST 2004


SciPy Users List <scipy-user at scipy.net> schrieb am 21.02.04 14:35:12: 
 
 
 
On Sat, 21 Feb 2004, Nils Wagner wrote: 
 
> I have disabled ATLAS. The problem with linalg.lu didn't vanish.  
> What can we do ?  
 
Are you absolutely sure that ATLAS is not being used (rebuilded linalg  
from scratch, removed earlier installations, eg `ldd blas.so` does not  
contain references to ATLAS symbols, etc etc)? 
 
Yes.  
 
nwagner at linux:/usr/local/lib/python2.3/site-packages/scipy/linalg> ldd cblas.so              
libg2c.so.0 => /usr/lib/libg2c.so.0 (0x40024000) 
        libm.so.6 => /lib/i686/libm.so.6 (0x40042000) 
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x40065000) 
        libc.so.6 => /lib/i686/libc.so.6 (0x4006d000) 
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000) 
 
Have you tried the two examples of mine from the earlier thread? 
Yes. they work fine for me. but lu.py failed again 
Please can you run lu.py  
 
from scipy import * 
from RandomArray import * 
n = 2 
A = rand(n,n)+rand(n,n)*1j 
X = zeros((n,n),Complex) 
Ainv = linalg.inv(A) 
R = identity(n)+identity(n)*0j 
# 
# linalg.solve cannot handle complex rhs !! 
# 
#R = R.real 
# 
for i in arange(0,n): 
   r = R[:,i] 
   X[:,i] = linalg.solve(A,r) 
# 
# Should be the inverse of A as well !!!! 
# 
print 
print 'X' 
print 
print X 
# 
# Inverse of A 
# 
print 
print 'inv(A)' 
print 
print Ainv 
print 
print 'Identity ???' 
print 
print dot(A,Ainv) 
print 
print 'Identity ???' 
print 
print dot(A,X) 
 
Thanks in advance 
 
 Nils 
 
Pearu 
 
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