Sparse Solver

[vittorio]

SPOOLES
http://www.netlib.org/linalg/spooles/spooles.2.2.html
I downloaded all the files (and created some PDF files) and packaged them here as well ( http://mystran.com/docs/SPOOLES.zip )
I thought I saw a section/link about how to use SPOOLES with Fortran, but can not find the link right now. I will add it later if I can find it. For reference, CalculiX uses SPOOLES and is written in Fortran.
I saw this example of how to build CalculiX with SPOOLES, so it may carry over to MYSTRAN? ( https://icme.hpc.msstate.edu/mediawiki/i...:_CALCULIX )
CalculiX has nonlinear capability (it has used SPOOLES for quite a while), but I am not sure if SPOOLES has nonlinear capability?
I also noticed a "correction" file for large input decks on the CalculiX site: ( http://www.dhondt.de/ )

PaStiX
http://pastix.gforge.inria.fr/files/READ...tml#PaStiX
About half way down is a section called "Calling PaStiX from Fortran"

All these solvers are linear. Calculix has nonlinear capabilities, but as any nonlinear fem program, the nonlinear solution is obtained using an algorithm based on a sequence of linear steps. 
Vittorio