TSDiscGradGetFormulation

Get the construction method for S, F, and grad F from the formulation \(u_t = S \nabla F\) for TSDISCGRAD

Synopsis

#include "petscts.h"   
PetscErrorCode TSDiscGradGetFormulation(TS ts, PetscErrorCode (**Sfunc)(TS ts, PetscReal time, Vec u, Mat S, void *ctx), PetscErrorCode (**Ffunc)(TS ts, PetscReal time, Vec u, PetscScalar *F, void *ctx), PetscErrorCode (**Gfunc)(TS ts, PetscReal time, Vec u, Vec G, void *ctx), void *ctx)

Not Collective

Input Parameter

• ts - timestepping context

Output Parameters

• Sfunc - constructor for the S matrix from the formulation

• Ffunc - functional F from the formulation

• Gfunc - constructor for the gradient of F from the formulation

• ctx - the user context

Calling sequence of Sfunc

• ts - the integrator

• time - the current time

• u - the solution

• S - the S-matrix from the formulation

• ctx - the user context

Calling sequence of Ffunc

• ts - the integrator

• time - the current time

• u - the solution

• F - the computed function from the formulation

• ctx - the user context

Calling sequence of Gfunc

• ts - the integrator

• time - the current time

• u - the solution

• G - the gradient of the computed function from the formulation

• ctx - the user context

See Also

TS: Scalable ODE and DAE Solvers, TS, TSDISCGRAD, TSDiscGradSetFormulation()

Level

intermediate

Location

src/ts/impls/implicit/discgrad/tsdiscgrad.c

Implementations

TSDiscGradGetFormulation_DiscGrad(TS ts, PetscErrorCode (**Sfunc)(TS, PetscReal, Vec, Mat, void *), PetscErrorCode (**Ffunc)(TS, PetscReal, Vec, PetscScalar *, void *), PetscErrorCode (**Gfunc)() in src/ts/impls/implicit/discgrad/tsdiscgrad.c

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