petsc-3.14.6 2021-03-30
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set TS implicit function evaluation function


#include "petscts.h" 
PetscErrorCode DMTSSetIFunction(DM dm,TSIFunction func,void *ctx)
Not Collective

Input Arguments

dm - DM to be used with TS
func - function evaluating f(t,u,u_t)
ctx - context for residual evaluation

Calling sequence of func

    PetscErrorCode func(TS ts,PetscReal t,Vec u,Vec u_t,Vec F,ctx);

t - time at step/stage being solved
u - state vector
u_t - time derivative of state vector
F - function vector
ctx - [optional] user-defined context for matrix evaluation routine


TSSetFunction() is normally used, but it calls this function internally because the user context is actually associated with the DM. This makes the interface consistent regardless of whether the user interacts with a DM or not. If DM took a more central role at some later date, this could become the primary method of setting the residual.

See Also

DMTSSetContext(), TSSetIFunction(), DMTSSetJacobian()




Index of all TS routines
Table of Contents for all manual pages
Index of all manual pages