DMMGSetSNESLocal

 Sets the local user function that defines the nonlinear set of equations that will use the grid hierarchy and (optionally) its derivative. Collective on DMMG

Synopsis

PetscErrorCode DMMGSetSNESLocal(DMMG *dmmg,DALocalFunction1 function, DALocalFunction1 jacobian,
DALocalFunction1 ad_function, DALocalFunction1 admf_function);

Input Parameter

dmmg - the context
function - the function that defines the nonlinear system
jacobian - function defines the local part of the Jacobian
ad_function - the name of the function with an ad_ prefix. This is ignored if ADIC is not installed
admf_function - the name of the function with an ad_ prefix. This is ignored if ADIC is not installed

Options Database Keys

Notes

If ADIC or ADIFOR have been installed, this routine can use ADIC or ADIFOR to compute the derivative; however, that function cannot call other functions except those in standard C math libraries.

If ADIC/ADIFOR have not been installed and the Jacobian is not provided, this routine uses finite differencing to approximate the Jacobian.

See Also

DMMGCreate(), DMMGDestroy, DMMGSetKSP(), DMMGSetSNES()

Level:intermediate
Location:src/snes/utils/damgsnes.c
Index of all DA routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/snes/examples/tutorials/ex19.c.html
src/snes/examples/tutorials/ex25.c.html
src/snes/examples/tutorials/ex27.c.html
src/snes/examples/tutorials/ex29.c.html
src/snes/examples/tutorials/ex30.c.html
src/snes/examples/tutorials/ex31.c.html
-dmmg_snes_monitor- . -dmmg_jacobian_fd
-dmmg_jacobian_ad- . -dmmg_jacobian_mf_fd_operator
-dmmg_jacobian_mf_fd- . -dmmg_jacobian_mf_ad_operator
-dmmg_jacobian_mf_ad- - -dmmg_jacobian_period <p> - Indicates how often in the SNES solve the Jacobian is recomputed (on all levels) as suggested by Florin Dobrian if p is -1 then Jacobian is computed only on first SNES iteration (i.e. -1 is equivalent to infinity)