petsc-master 2015-04-24
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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 or TSSetRHSFunction() to define the ODE. When solving DAEs you must use this function.

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