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Gnuplot (version 4.0.0)
Gnuplot is a command-driven interactive function plotting program.
If files are given, gnuplot loads each file with the load command, in the order specified. Gnuplot exits after the last file is processed.
Here are some of its features:
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 com- pare 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, Linux, 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 graph- ics. The PC version compiled by Borland C++ supports 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.
Load and save capability.
All computations performed in the complex domain. Just the real part is plotted by default, but functions like imag() and abs() and arg() are available to override this.