DMTSSetIFunction#

set TS implicit function evaluation function

Synopsis#

#include "petscts.h" 
PetscErrorCode DMTSSetIFunction(DM dm, TSIFunction func, void *ctx)

Not Collective

Input Parameters#

  • 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,void *ctx);

  • ts - the TS context obtained from TSCreate()

  • 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

Note#

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#

TS: Scalable ODE and DAE Solvers, TS, DM, DMTSSetContext(), TSSetIFunction(), DMTSSetJacobian()

Level#

advanced

Location#

src/ts/utils/dmts.c

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