Gnuplot is a portable command-line driven interactive data and function plotting utility that supports lots of output formats, including drivers for many printers, (la)tex, (x)fig, postscript, and so on. the x11-output is packaged in gnuplot5-x11.

data files and self-defined functions can be manipulated by the internal c-like language. can perform smoothing, spline-fitting, or nonlinear fits, and can work with complex numbers.

this package contains the additional documentation.