Gnuplot is a command-driven interactive function plotting program. Plots any number of functions, built up of C operators, C library functions, and some things C doesn't have like **, sgn(), etc. Also support for plotting data files, to compare actual data to theoretical curves. User-defined X and Y ranges (optional auto-ranging), smart axes scaling, smart tic marks. Labelling of X and Y axes. User-defined constants and functions. Support through a generalized graphics driver for AED 512, AED 767, BBN BitGraph, Commodore Amiga, Roland DXY800A, EEPIC, TeXDraw, EmTeX, Epson 60dpi printers, Epson LX-800, Fig, HP2623, HP2648, HP75xx, HPGL, HP LaserJet II, Imagen, Iris 4D, MS-DOS Kermit, Kyocera laser printer, LaTeX, NEC CP6 pinwriter, PostScript, QMS QUIC, ReGis (VT125 and VT2xx), SCO Xenix CGI, Selanar, Star color printer, Tandy DMP-130 printer, Tek 401x, Tek 410x, Vectrix 384, VT like Tektronix emulator, Unix PC (ATT 3b1 or ATT 7300), unixplot, and X11. The PC version compiled by Microsoft C supports IBM CGA, EGA, VGA, Hercules, ATT 6300, and Corona 325 graphics. The PC version compiled by Borland C++ sup- ports IBM CGA, EGA, MCGA, VGA, Hercules and ATT 6300 graphics. Other devices can be added simply, but will require recompiling. Shell escapes and command line substitution. Output redirection.