The IMSL Fortran Numerical Library contains routines which take advantage of Fortran 90 language constructs, including Fortran 90 array data types. One feature of the design is that the default use may be as simple as the problem statement. Complicated, professional-quality mathematical software is hidden from the casual or beginning user.

In addition, high-level operators and functions are provided in the Library. They are described in Chapter 10, “Linear Algebra Operators and Generic Functions”.