MatGetVecs and MATMFFD

Boyce Griffith griffith at
Thu Aug 21 07:01:16 CDT 2008

Hi, Folks --

I am using a home-grown "multi-Vec" (i.e., vector of vectors) 
implementation with a PETSc nonlinear solver.  I'd like to be able to use 
PETSc's matrix-free Jacobian with this solver along with a PCCOMPOSITE 
preconditioner; however, it seems like I need to override the default 
implementation of MatGetVecs in order to get this to work.

Is there a kosher way to do this?


-- Boyce

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