TSSetIFunction#

Set the function to compute F(t,U,U_t) where F() = 0 is the DAE to be solved.

Synopsis#

#include "petscts.h"  
PetscErrorCode TSSetIFunction(TS ts, Vec r, TSIFunction f, void *ctx)

Logically Collective

Input Parameters#

  • ts - the TS context obtained from TSCreate()

  • r - vector to hold the residual (or NULL to have it created internally)

  • f - the function evaluation routine

  • ctx - user-defined context for private data for the function evaluation routine (may be NULL)

Calling sequence of f#

PetscErrorCode f(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#

The user MUST call either this routine or TSSetRHSFunction() to define the ODE. When solving DAEs you must use this function.

See Also#

TS: Scalable ODE and DAE Solvers, TS, TSSetRHSJacobian(), TSSetRHSFunction(), TSSetIJacobian()

Level#

beginner

Location#

src/ts/interface/ts.c

Examples#

src/ts/tutorials/ex10.c
src/ts/tutorials/ex14.c
src/ts/tutorials/ex15.c
src/ts/tutorials/ex16.c
src/ts/tutorials/ex17.c
src/ts/tutorials/ex19.c
src/ts/tutorials/ex20.c
src/ts/tutorials/ex20adj.c
src/ts/tutorials/ex20fwd.c
src/ts/tutorials/ex20opt_ic.c
src/ts/tutorials/ex20opt_p.c

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