petsc-3.13.6 2020-09-29
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Set the function to compute F(t,U,U_t,U_tt) where F = 0 is the DAE to be solved.


#include "petscts.h"  
PetscErrorCode TSSetI2Function(TS ts,Vec F,TSI2Function fun,void *ctx)
Logically Collective on TS

Input Parameters

ts - the TS context obtained from TSCreate()
F - vector to hold the residual (or NULL to have it created internally)
fun - the function evaluation routine
ctx - user-defined context for private data for the function evaluation routine (may be NULL)

Calling sequence of fun

    PetscErrorCode fun(TS ts,PetscReal t,Vec U,Vec U_t,Vec U_tt,Vec F,ctx);

t - time at step/stage being solved
U - state vector
U_t - time derivative of state vector
U_tt - second time derivative of state vector
F - function vector
ctx - [optional] user-defined context for matrix evaluation routine (may be NULL)

See Also





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