Gpic

The gpic terminal driver generates GPIC graphs in the Free Software Foundations's "groff" package. The default size is 5 x 3 inches. The only option is the origin, which defaults to (0,0).

Syntax:

     set terminal gpic {<x> <y>}

where x and y are in inches.

A simple graph can be formatted using

     groff -p -mpic -Tps file.pic > file.ps.

The output from pic can be pipe-lined into eqn, so it is possible to put complex functions in a graph with the set label and set {x/y}label commands. For instance,

     set ylab '@space 0 int from 0 to x alpha ( t ) roman d t@'

will label the y axis with a nice integral if formatted with the command:

     gpic filename.pic | geqn -d@@ -Tps | groff -m[macro-package] -Tps
         > filename.ps

Figures made this way can be scaled to fit into a document. The pic language is easy to understand, so the graphs can be edited by hand if need be. All co-ordinates in the pic-file produced by gnuplot are given as x+gnuplotx and y+gnuploty. By default x and y are given the value 0. If this line is removed with an editor in a number of files, one can put several graphs in one figure like this (default size is 5.0x3.0 inches):

     .PS 8.0
     x=0;y=3
     copy "figa.pic"
     x=5;y=3
     copy "figb.pic"
     x=0;y=0
     copy "figc.pic"
     x=5;y=0
     copy "figd.pic"
     .PE

This will produce an 8-inch-wide figure with four graphs in two rows on top of each other.

One can also achieve the same thing by the command

     set terminal gpic x y

for example, using

     .PS 6.0
     copy "trig.pic"
     .PE