#include "petscds.h"
PetscErrorCode PetscDSGetResidual(PetscDS prob, PetscInt f,
void (**f0)(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 f0[]),
void (**f1)(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 f1[]))
Not collective
| prob | - The PetscDS | |
| f | - The test field number |
| f0 | - integrand for the test function term | |
| f1 | - integrand for the test function gradient term |
\int_\Omega \phi f_0(u, u_t, \nabla u, x, t) + \nabla\phi \cdot {\vec f}_1(u, u_t, \nabla u, x, t)
f0(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[], PetscScalar f0[])
| dim | - the spatial dimension | |
| Nf | - the number of 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 | |
| f0 | - output values at the current point |