[SciPy-user] help building scipy on Opteron 64 bit

[Pearu Peterson]

On Tue, 1 Mar 2005, Leila baghdadi wrote:

> Hello everyone,
>
> I am new to this so bear with me!
>
> I have been trying to build scipy on our Opteron machine (linux
> enterprise 3, gcc 3.2.3) and had no success,
>
> I searched the mailing list and found the link about optimization and
> gcc version
> http://www.scipy.net/pipermail/scipy-user/2004-November/003815.html
>
> and decided to only build blas and lapack and see if I can get the
> correct answer for the example that is given in the above link
>
> I tried  with gcc 3.2.3 and no optimization and had no luck
>
> I then build a local copy of gcc 3.4.3 and tried with/without
> optimization and still have no luck
>
> my answers are
>
> wr=9.32183,-9.59852e-16,-0.321825,wi=0,0,0
>
> whereas the above link gives
> wr=9.32183,-6.20979e-16,-0.321825,wi=0,0,0

I don't see what is the problem here, the results are equal up-to 
numerical noice. It is normal to get slightly different results when using 
Fortran compiled blas/lapack or ATLAS blas/lapack.

Pearu