[petsc-users] Setting initial guess for KSP solver

[Jed Brown]

On Wed, Sep 26, 2012 at 7:33 PM, Jinquan Zhong <jzhong at scsolutions.com>wrote:

>         PetscErrorCode  KSPSetInitialGuessNonzero(KSP ksp,PetscBool  flg)*
> ***
>
>                 ****
>
> does not provide the option to input x0 though.
>

It causes the vector X that you pass to KSPSolve to be used as the initial
guess. Did you read the man page?

http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPSetInitialGuessNonzero.html
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