Matrix Function (MFN) is the object provided by SLEPc for computing the action of a matrix function on a vector. Given a matrix A and a vector b, the call
MFNSolve(mfn,b,x) computes x=f(A)b, where f is a function such as the exponential.
ex23.c: Computes exp(t*A)*v for a matrix associated with a Markov model
ex26.c: Computes the action of the square root of the 2-D Laplacian
ex37.c: Computes exp(t*A)*v for an advection diffusion operator with Peclet number
ex39.c: Exponential integrator for the heat equation with source term