tool A command-driven interactive graphing program. Gnuplot

can plot two-dimensional functions and data points in many

different styles (points, lines, error bars); and

three-dimensional data points and surfaces in many different

styles (contour plot, mesh). It supports complex arithmetic

and user-defined functions and can label title, axes, and data

points. It can output to several different graphics file

formats and devices. Command line editing and history are

supported and there is extensive on-line help.