... just over 300 lines of BASIC is the capability to solve linear equations, linear least squares, matrix inverse and generalised inverse, sym-metric matrix eigenproblem and nonlinear least squares ... general, and in essence none (apart from a few manufac-turers’ offerings) for users of small computers. This situation has changed remark-ably, with some thousands of suppliers. Source codes of ... over-large set of symbols. In fact, I have used greek letters aslittle as possible to save my typists’ and typesetters’ effort. However, withinchapters and within a subject area the symbols should...