Periodic block tridiagonal solver

[zuheyr]

Hello,

I am looking for a periodic block tridiagonal solver, preferably in fortran90. Could somebody please point me a free source? I have downloaded many software packages but they do not fit my purpose.

It is a real (not complex) variable solver, block are 2x2 and periodic.

Many thanks for reading,
Regards, Zuheyr

 

[GerritGroot]

Isn't there anything about this in "Numerical Recipes for fortran 90"?

Just guessing...

The book in online I think in

http://www.nr.com

or so.

 

[zuheyr]

Hi, thank you for your response.
I checked the NR but as far as I can see there is no direct subroutine to use. Unfortunately.

I am very surprised that even in blas,linpack,fishpack I could not find it. Fishpack calls it block tridiagonal but it is in fact laplace equation.

I am very surprised.
Anyway, many thanks to you,
Kind regards,
Zuheyr