Enum KrylovMethod 

pub enum KrylovMethod {
    ConjugateGradients,
    Minres,
    Gmres(usize),
}

Available Krylov subspace linear solvers.

Variants

ConjugateGradients

Conjugate gradients, descending the quadratic the system is the stationary point of.

Needs the operator positive definite, and says so when it is not. Where that holds it is the cheaper of the two, keeping three vectors rather than six.

Minres

The minimal residual method, shortening the residual over the subspace reached so far.

An operator with no minimum still has a residual with a shortest length, so this asks only for symmetry and serves the systems conjugate gradients has to refuse.

Gmres(usize)

The generalized minimal residual method, restarted after the given number of iterations.

Asks nothing of the operator, so it serves the nonsymmetric systems the other two have to refuse. The preconditioner acts on the right, leaving the residual it minimizes the true one, at the cost of keeping a basis of up to twice the restart length.

Trait Implementations

impl Clone for KrylovMethod

fn clone(&self) -> KrylovMethod

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for KrylovMethod

impl Debug for KrylovMethod

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for KrylovMethod

fn default() -> KrylovMethod

Returns the “default value” for a type.