Re: NLEQ1 and open source Fortran
- From: feenberg@xxxxxxxxx
- Date: 28 Aug 2005 05:53:56 -0700
rlopneg wrote:
> Hello I've been having some troubles trying to solve al large scale
> nonlinear system using nleq1. When I compile it using Intel's Fortran
> Compiler everything works properly, but since I'm trying not to use
> comercial software I tried compiling my program using GNU's (gcc)
> GFortran. When doing this I get the solver stops due to singular matrix
> problems. I've checked that the SMALL and EPMACH values are the right
> ones for my machine, and I'm using the files downloaded right from
> http://www.zib.de/Numerik/numsoft/CodeLib/codes/nleq1/. And besides
> that, the solver works fine with Intel's fortran...
>
> Does any body know how to correct this, or why it works on comercial
> fortran compilers and not with open source compilers??
>
> thanks,
> Rodrigo
Does g95 fail only on large problems, or on all problems? If the
latter, do your testing on the smallest problem you can make up.
You are lucky to have access to both compilers at the same time.
Instrument the program with a number of print statements for
intermediate results, and run with both compliters, then locate where
g95 goes wrong in the output. Instrument some more till you find the
problem and either file a bug report or fix the source.
Daniel Feenberg
NBER
feenberg is at nber dotte org
.
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