PETSc version 3.15.5
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# TSSetCostIntegrand

Sets the routine for evaluating the integral term in one or more cost functions

### Synopsis

    #include "petscts.h"
    PetscErrorCode TSSetCostIntegrand(TS ts,PetscInt numcost,Vec costintegral,PetscErrorCode (*rf)(TS,PetscReal,Vec,Vec,void*),
                                                              PetscErrorCode (*drduf)(TS,PetscReal,Vec,Vec*,void*),
                                                              PetscErrorCode (*drdpf)(TS,PetscReal,Vec,Vec*,void*),
                                                              PetscBool fwd,void *ctx)

Logically Collective on TS

### Input Parameters

| ts | - the TS context obtained from TSCreate()
| numcost | - number of gradients to be computed, this is the number of cost functions
| costintegral | - vector that stores the integral values
| rf | - routine for evaluating the integrand function
| drduf | - function that computes the gradients of the r's with respect to u
| drdpf | - function that computes the gradients of the r's with respect to p, can be NULL if parametric sensitivity is not desired (mu=NULL)
| fwd | - flag indicating whether to evaluate cost integral in the forward run or the adjoint run
| ctx | - [optional] user-defined context for private data for the function evaluation routine (may be NULL)

### Calling sequence of rf

      PetscErrorCode rf(TS ts,PetscReal t,Vec U,Vec F,void *ctx);

### Calling sequence of drduf

      PetscErroCode drduf(TS ts,PetscReal t,Vec U,Vec *dRdU,void *ctx);

### Calling sequence of drdpf

      PetscErroCode drdpf(TS ts,PetscReal t,Vec U,Vec *dRdP,void *ctx);

### Notes

For optimization there is usually a single cost function (numcost = 1). For sensitivities there may be multiple cost functions

### See Also

TSSetRHSJacobianP(), TSGetCostGradients(), TSSetCostGradients()

### Level

deprecated

### Location

src/ts/interface/sensitivity/tssen.c
Index of all Sensitivity routines
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