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,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

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

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