help me please 2

[bastadoni]

hello everyone i desperately need your help cuuz i'm suffring down here because of my teacher who doesn't help me much.... my thing is how to inverse a Matrix in fortran 90?
We work with the famous book 'Numerical recepeis' and I have some ideas but i don't thing it's enough cuz i need to organise them, i think that i can do it with the module SPARSE, PKRSMIN and the ASUB and ATSUB.
thank you a lot guys for your time and i would preciate a lot your help.

 

[SkipVought]

hi,

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[FJacq]

SkipVought is right : we don't intend to to your home work.

Anyway, I am less rigourous : If you show us what you have done up to now and if you are able to explain clearly the trouble you meet and all the attempts you have done to solve them, then perhaps, I could provide few advices.

François Jacq

 

[bastadoni]

ok the equation is (Atrans*A)-1 i want to calculate this using Asub and ATSUB and SPARSE

 

[mikrom]

Manually you can compute inverse to a given matrix using GEM (Gauss Elimination Method) - look here:

http://www.mathportal.org/linear-algebra/matrices/gauss-jordan.php

IMO, you should create or use existing procedure for GEM (or its modification) to find inverse.

 

[bastadoni]

thanks a lot Mikrom