<div>Hi,</div> <div> </div> <div>I met a problem ,when I constructed a user-defined PC. That is I need to defind the process of P^(-1)Mx in each iteration of GMRES by myself for efficient reason, not only define P^(-1)x . But the Petsc seems to separate this process into two parts: the first is y=Mx which is defined in Petsc framework, and the second is P^(-1)y which is defined by the user. So, is there any way to do it without change the code of Petsc framework?</div> <div> </div> <div>Regards,</div> <div>Jiaxun</div><p> 
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