# Linear Solvers and Krylov Methods (KSP) The `KSP` class provides an easy-to-use interface to the combination of a Krylov subspace iterative method and a preconditioner `PC` for the solution of linear systems and some least squares problems. See `PETSCREGRESSORLINEAR` for additional regression (least squares) solvers. Examples

Source files

borthog.c
gmpre.c
gmreig.c
gmres2.c
borthog2.c
gmres.c
gmresimpl.h

Directories

agmres
dgmres
fgmres
ftn-custom
lgmres
pgmres
pipefgmres