[petsc-users] Two PCs on same residual in multiplicative fashion !

[Abdul Hanan Sheikh]

Dear Developers and members, 


I intend to solve system Ax=b with two preconditioners as follows: 


P1^{-1} P2^{-1} A x = P^{-1} P^{-1} b

where P1 and P2 are exclusively available as matrices. 

This might be crazy to many. 


I thought to start with PCCOMPOSITE but i do not think it does exactly what I intend. 

Any Idea would be appreciated. 


A beginner!!! 

Abdul
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