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       gnuplot - an interactive plotting program


       gnuplot [X11 options] [options] [file ...]


       Gnuplot is a command-driven interactive plotting program.

       If  file  names  are  given  on  the  command  line, gnuplot loads each file with the load
       command, in the order specified, and exits after the last file is processed.  If no  files
       are given, gnuplot prompts for interactive commands.

       Here are some of its features:

       Plots any number of functions, built up of C operators, C math library functions, and some
       things C doesn't have like **, sgn(), etc.

       User-defined constants and functions.

       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.

       Many  presentation  styles  for  plotting user data from files, including surface-fitting,
       error bars, boxplots, histograms, heat maps, and simple manipulation of image data.  There
       is an on-line demo collection at

       Nonlinear least-squares fitting.

       2D and 3D plots with mouse-controlled zoom and rotation.

       Shell escapes and command line substitution.

       Load and save capability.

       Support for a huge variety of output devices and file formats.


       -p, --persist lets plot windows survive after main gnuplot program exits.

       -d, --default settings.  Do not read from gnuplotrc or ~/.gnuplot on entry.

       -e "command list" executes the requested commands before loading the next input file.

       -h, --help print summary of usage

       -V show current version


       Gnuplot  provides  the x11 terminal type for use with X servers. This terminal type is set
       automatically at startup if the GNUTERM environment variable is set  to  x11,  or  if  the
       -display command line option is used.  For terminal type x11, gnuplot accepts the standard
       X Toolkit options and resources such as geometry, font, and background. See the  X(1)  man
       page  for  a description of common options.  For additional X options specific to gnuplot,
       type help x11 on the gnuplot command line.


       A number of shell environment variables are understood by  gnuplot.   None  of  these  are

              The name of the terminal type to be used by default.  This can be overridden by the
              gnuplotrc or .gnuplot start-up  files  and,  of  course,  by  later  explicit  "set
              terminal" commands.

              The pathname of the HELP file (gnuplot.gih).

       HOME   The name of a directory to search for a .gnuplot file.

       PAGER  An output filter for help messages.

       SHELL  The program used for the "shell" command.

              Specifies  a  gnuplot  command to be executed when a fit is interrupted---see "help

              The name of the logfile maintained by fit.

              Additional search directories for data and command files. The variable may  contain
              a single directory name, or a list of directories separated by ':'. The contents of
              GNUPLOT_LIB are appended to the "loadpath" variable, but not saved with the  "save"
              and "save set" commands.

              Several  gnuplot  terminal  drivers access TrueType fonts via the gd library.  This
              variable gives the font search path for these drivers.

              The default font for the terminal drivers that access TrueType  fonts  via  the  gd

              The font search path used by the postscript terminal. The format is the same as for
              GNUPLOT_LIB. The contents  of  GNUPLOT_FONTPATH  are  appended  to  the  "fontpath"
              variable, but not saved with the "save" and "save set" commands.

              Used  by  the postscript driver to locate external prologue files. Depending on the
              build process, gnuplot contains either a builtin copy of those files  or  simply  a
              default  hardcoded  path.  Use  this  variable to test the postscript terminal with
              custom prologue files. See "help postscript prologue".


              When gnuplot is run, it first looks for a  system-wide  initialization  file  named
              gnuplotrc.   The standard location of this file expected by the program is reported
              by the "show loadpath" command.

              After loading the system-wide initialization file, if  any,  Gnuplot  looks  for  a
              private  initialization  file  in  the  HOME  directory.   It may contain any legal
              gnuplot commands, but typically they are limited to setting the preferred  terminal
              and line types and defining frequently-used functions or variables.

              The default name of the logfile output by the "fit" command.


       Original  authors:  Thomas  Williams and Colin Kelley.  Starting with gnuplot version 3.8,
       the project source is cooperatively  maintained  on  SourceForge  by  a  large  number  of


       Please report bugs using the project bug tracker on SourceForge.


       See  the printed manual or the on-line help for details on specific commands.  Project web
       site at