Mark Adams <[email protected]> writes: > We have a question about the RHS Jacobian (G) for TS. The manual says: > > • Jacobian Gu > If using a fully implicit method and the function G() is provided, one > also can provide an appropriate (approximate) Jacobian matrix of G(). > > If we use, say, backward Euler and provide a G Jacobian, does PETSc > use this G Jacobian in some way? or is the G Jacobian only used for > IMEX methods?
IMEX methods typically do not use the RHS Jacobian, but fully implicit methods will move it over to the left hand side in order to be implicit.
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