Fortran 90 Source Files

There are two Fortran 90 modules that are part of the max-ent library. These are in the source files maxent.f90 and priorweightfunction.f90, and implementations for steepest descent and Newton's method are available. To provide access to the L-BFGS algorithm, a driver subroutine is included in maxent.f90, with a call to the public-domain limited-memory BFGS subroutine (Fortran 77 implementation) [19]. If a different convex optimization algorithm is desired, the appropriate driver routine can be added in maxent.f90 to provide an interface to the subroutine/function in which the algorithm of interest is implemented. We now discuss some of the main features and computational details that are contained in the two Fortran 90 modules.