Gnuplot Question:

► Plotting two-dimensional functions and data points in many different styles (points, lines, error bars)
► Plotting three-dimensional data points and surfaces in many different styles (contour plot, mesh)
► Algebraic computation in integer, float and complex arithmetic
► User-defined functions and hot-keys
► Support for a large number of operating systems, graphics file formats and output devices
► Extensive on-line help
► TEX-like text formatting for labels, titles, axes, data points
► Interactive command line editing and history (most platforms)