MatFDColoringSetFromOptions#
Sets coloring finite difference parameters from the options database.
Synopsis#
#include "petscmat.h" 
PetscErrorCode MatFDColoringSetFromOptions(MatFDColoring matfd)
Collective
The Jacobian, F’(u), is estimated with the differencing approximation
       F'(u)_{:,i} = [F(u+h*dx_{i}) - F(u)]/h where
       h = error_rel*u[i]                 if  abs(u[i]) > umin
         = +/- error_rel*umin             otherwise, with +/- determined by the sign of u[i]
       dx_{i} = (0, ... 1, .... 0)
Input Parameter#
- matfd - the coloring context 
Options Database Keys#
- -mat_fd_coloring_err - - Sets- (square root of relative error in the function) 
- -mat_fd_coloring_umin - - Sets umin, the minimum allowable u-value magnitude
- -mat_fd_type - “wp” or “ds” (see MATMFFD_WP or MATMFFD_DS) 
- -mat_fd_coloring_view - Activates basic viewing 
- -mat_fd_coloring_view ::ascii_info - Activates viewing info 
- -mat_fd_coloring_view draw - Activates drawing 
See Also#
Mat, MatFDColoring, MatFDColoringCreate(), MatFDColoringView(), MatFDColoringSetParameters()
Level#
intermediate
Location#
Examples#
src/mat/tutorials/ex16.c
src/tao/unconstrained/tutorials/minsurf2.c
src/snes/tutorials/ex14.c
Index of all MatFD routines
Table of Contents for all manual pages
Index of all manual pages