calling PETSc from Fortan main routine

[Waad Subber]

Hello Everyone,

I am a new PETSc user; and I am wondering if any one can help me with the following issue.

The issue is I want to write KSP solver with all the required objects in an external subroutine and then call it from my main program. I don't know if I can do that. 

What I mean is I have a main code consist of several subroutines and I want to change my solver with PETSc solver with keeping the same structure of my main program. 

Thanks :)

Waad

       
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