PetscErrorCode PETSCSNES_DLLEXPORT SNESLineSearchQuadratic(SNES snes,void *lsctx,Vec x,Vec f,Vec g,Vec y,Vec w,PetscReal fnorm,PetscReal xnorm,PetscReal *ynorm,PetscReal *gnorm,PetscTruth *flag)Collective on SNES and Vec
snes | - the SNES context | |
lsctx | - optional context for line search (not used here) | |
x | - current iterate | |
f | - residual evaluated at x | |
y | - search direction | |
w | - work vector | |
fnorm | - 2-norm of f | |
xnorm | - norm of x if known, otherwise 0 |
g | - residual evaluated at new iterate w | |
w | - new iterate (x + lambda*y) | |
gnorm | - 2-norm of g | |
ynorm | - 2-norm of search length | |
flag | - PETSC_TRUE if line search succeeds; PETSC_FALSE on failure. |
-snes_ls quadratic | - Activates SNESLineSearchQuadratic() | |
-snes_ls_alpha <alpha> | - Sets alpha | |
-snes_ls_maxstep <maxstep> | - Sets the maximum stepsize the line search will use (if the 2-norm(y) > maxstep then scale y to be y = (maxstep/2-norm(y)) *y) | |
-snes_ls_minlambda <minlambda> | - Sets the minimum lambda the line search will use minlambda/ max_i ( y[i]/x[i] ) |
Level:advanced
Location:src/snes/impls/ls/ls.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages