TSSetRHSFunction#

Sets the routine for evaluating the function, where U_t = G(t,u).

Synopsis#

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

Logically Collective

Input Parameters#

  • ts - the TS context obtained from TSCreate()

  • r - vector to put the computed right hand side (or NULL to have it created)

  • f - routine for evaluating the right-hand-side function

  • ctx - [optional] 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 F, void *ctx)

  • ts - timestep context

  • t - current timestep

  • u - input vector

  • F - function vector

  • ctx - [optional] user-defined function context

Note#

You must call this function or TSSetIFunction() to define your ODE. You cannot use this function when solving a DAE.

See Also#

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

Level#

beginner

Location#

src/ts/interface/ts.c

Examples#

src/tao/unconstrained/tutorials/burgers_spectral.c
src/tao/unconstrained/tutorials/spectraladjointassimilation.c
src/ts/tutorials/ex1.c
src/ts/tutorials/ex12.c
src/ts/tutorials/ex13.c
src/ts/tutorials/ex16.c
src/ts/tutorials/ex16fwd.c
src/ts/tutorials/ex1f.F90
src/ts/tutorials/ex2.c
src/ts/tutorials/ex20.c
src/ts/tutorials/ex20adj.c

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