Description IMSL provides high-performance computing software and expertise needed to develop and execute sophisticated numerical analysis applications. These libraries free you from developing your own code by providing pre-written mathematical and statistical algorithms that you can embed into your Fortran applications. Currently we provide only the Fortran libraries. The numerical algorithms of the IMSL Fortran Library can be accessed using Fortran 77 or using Fortran 90 language constructs. Some of the Fortran 90 implementation of IMSL routines let users take advantage of parallel computing through the library’s underlying use of the Message Passing Interface (MPI) libraries if their environment supports it (e.