Graphical user interfaces for numerical libraries

This paper presents a portable and inexpensive way of developing high-quality grapical user interface front-end components to high quality numerical libraries. The GUI components are developed using the public domain software Tool Command Language (Tcl) and the associated Tool Kit(Tk). l GUI designs are illustrated using the numerical libraries NAG FORTRAN77 (Mark 16)/FORTRAN90 (Release 1). The approach is generic and can be easily adopted to user written programs. per concludes with a discussion of merits of the present approach.