Premade SciMLOperators

ScalarOperator(val[; update_func])

(α::ScalarOperator)(a::Number) = α * a

Represents a time-dependent scalar/scaling operator. The update function is called by update_coefficients! and is assumed to have the following signature:

update_func(oldval,u,p,t) -> newval

struct NullOperator{N} <: SciMLOperators.AbstractSciMLLinearOperator{Bool}

MatrixOperator(A[; update_func])

Represents a time-dependent linear operator given by an AbstractMatrix. The update function is called by update_coefficients! and is assumed to have the following signature:

update_func(A::AbstractMatrix,u,p,t) -> [modifies A]

Diagonal Operator

L = AffineOperator(A, B, b)
L(u) = A*u + B*b

Matrix free operators (given by a function)

ScaledOperator

(λ L)*(u) = λ * L(u)

Lazy operator composition

∘(A, B, C)(u) = A(B(C(u)))

ops = (A, B, C)
cache = (B*C*u , C*u)

Lazy operator addition

(A1 + A2 + A3...)u = A1*u + A2*u + A3*u ....

Lazy Operator Inverse