#include "petscmat.h" PetscErrorCode MatFDColoringSetFromOptions(MatFDColoring matfd)Collective on MatFDColoring
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)
| coloring | - the coloring context |
| -mat_fd_coloring_err <err> | - Sets <err> (square root of relative error in the function) | |
| -mat_fd_coloring_umin <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 |