A q + B' u = f B q + C u = g
where A
is symmetrical, positive definite. While a
mixed problem can be formulated as a linear problem, a mixed
solver can often be more efficient.
The basic interface is {@link smt.iter.mixed.MixedSolver MixedSolver}, and there are three implementations:
The last method is often the fastest. All these use a solver for
the A
matrix, by default {@link smt.iter.CG
CG} is used, but different solvers can be set using {@link
smt.iter.mixed.MixedSolver#setSubSolver(smt.iter.IterativeSolver)
MixedSolver.setSubSolver}.