petsc-master 2014-12-17
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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 res,TSIFunction f,void *ctx)
Logically Collective on TS

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

 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

Important

The user MUST call either this routine, TSSetRHSFunction(). This routine must be used when not solving an ODE, for example a DAE.

Keywords

TS, timestep, set, DAE, Jacobian

See Also

TSSetRHSJacobian(), TSSetRHSFunction(), TSSetIJacobian()

Level:beginner
Location:
src/ts/interface/ts.c
Index of all TS routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/ts/examples/tutorials/ex8.c.html
src/ts/examples/tutorials/ex10.c.html
src/ts/examples/tutorials/ex14.c.html
src/ts/examples/tutorials/ex15.c.html
src/ts/examples/tutorials/ex16.c.html
src/ts/examples/tutorials/ex17.c.html
src/ts/examples/tutorials/ex19.c.html
src/ts/examples/tutorials/ex20.c.html
src/ts/examples/tutorials/ex22.c.html
src/ts/examples/tutorials/ex23.c.html
src/ts/examples/tutorials/ex24.c.html