Yorick is a very fast interpreted language designed for scientific computing and numerical analysis. The syntax is similar to C, but without declarative statements. Operations between arrays yield array results, and Yorick provides a very rich selection of multi-dimensional array indexing operations. Yorick also features a binary I/O package which automatically translates floating point and integer representations on the machine where it is running to and from the format of any other machine. Thus, you can easily share binary files between, for example, Cray YMPs and DEC alphas, or \\teach\\ Yorick to read existing binary databases. Yorick also offers an interactive graphics package based on X windows. X-Y plots, quadrilateral meshes, filled meshes, cell arrays, and contours are supported. Finally, you can embed compiled routines in custom versions of Yorick to solve problems for which the interpreter is too slow. The primary use of Yorick to date has been as a pre- and post-processor for large physical simulation programs. This version is current as of 4 February 1998 and was built on RedHat 5.0, using glibc 2 Summary: Yorick matrix language interpreter with X11 graphics system.