PetscDSGetObjective

Get the pointwise objective function for a given test field

Synopsis

#include "petscds.h" 
PetscErrorCode PetscDSGetObjective(PetscDS ds, PetscInt f, void (**obj)(PetscInt dim, PetscInt Nf, PetscInt NfAux, const PetscInt uOff[], const PetscInt uOff_x[], const PetscScalar u[], const PetscScalar u_t[], const PetscScalar u_x[], const PetscInt aOff[], const PetscInt aOff_x[], const PetscScalar a[], const PetscScalar a_t[], const PetscScalar a_x[], PetscReal t, const PetscReal x[], PetscInt numConstants, const PetscScalar constants[], PetscScalar obj[]))

Not Collective

Input Parameters

• ds - The PetscDS

• f - The test field number

Output Parameter

• obj - integrand for the test function term

Calling sequence of obj

• dim - the spatial dimension

• Nf - the number of fields

• NfAux - the number of auxiliary fields

• uOff - the offset into u[] and u_t[] for each field

• uOff_x - the offset into u_x[] for each field

• u - each field evaluated at the current point

• u_t - the time derivative of each field evaluated at the current point

• u_x - the gradient of each field evaluated at the current point

• aOff - the offset into a[] and a_t[] for each auxiliary field

• aOff_x - the offset into a_x[] for each auxiliary field

• a - each auxiliary field evaluated at the current point

• a_t - the time derivative of each auxiliary field evaluated at the current point

• a_x - the gradient of auxiliary each field evaluated at the current point

• t - current time

• x - coordinates of the current point

• numConstants - number of constant parameters

• constants - constant parameters

• obj - output values at the current point

Note

We are using a first order FEM model for the weak form: \( \int_\Omega \phi\,\mathrm{obj}(u, u_t, \nabla u, x, t)\)

See Also

PetscDS, PetscDSSetObjective(), PetscDSGetResidual()

Level

intermediate

Location

src/dm/dt/interface/dtds.c

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