... graphical user interface, in which many programs,files, and instructions are shown pictorially, and in which many operationscan be performed by ‘pointing and clicking’, an approach pioneered in ... signal and noise. Its main focus,Preface xiiihowever, is on numerical analysis, and it covers such aspects as finding roots and fittingcurves, integrating, differentiating, smoothing, and interpolating ... near-immediate response to changes in theirinput parameters, for their ease in making graphs, for their open format and intuitive lay-out, and for their forgiving error-handling. For these reasons...