TSRHSJacobianSetReuse

restore the RHS Jacobian before calling the user-provided TSRHSJacobianFn function again

Synopsis

#include "petscts.h"  
PetscErrorCode TSRHSJacobianSetReuse(TS ts, PetscBool reuse)

Logically Collective

Input Parameters

• ts - TS context obtained from TSCreate()

• reuse - PETSC_TRUE if the RHS Jacobian

Notes

Without this flag, TS will change the sign and shift the RHS Jacobian for a finite-time-step implicit solve, in which case the user function will need to recompute the entire Jacobian. The reuse flag must be set if the evaluation function assumes that the matrix entries have not been changed by the TS.

See Also

TS: Scalable ODE and DAE Solvers, TS, TSSetRHSJacobian(), TSComputeRHSJacobianConstant()

Level

intermediate

Location

src/ts/interface/ts.c

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Index of all TS routines
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