Type of function objects to interface with SUNDIALS linear solvers
This function type encapsulates the action of solving . The LinearOperatorop encapsulates the matrix vector product and the LinearOperatorprec encapsulates the application of the preconditioner . The user can specify function objects of this type to attach custom linear solver routines to SUNDIALS. The two LinearOperators op and prec are built internally by SUNDIALS based on user settings. The parameters are interpreted as follows: