A shameless plug for string variables

[Ethan M. <merritt@u.washington.edu>]

So there I was... thinking about two recent requests for
gnuplot features.

One is now listed as RFE #1040597  "user-definable point symbols"
The other one, from comp.graphics.apps.gnuplot, asked how to
make a plot where the coordinate pair itself was printed at the
appropriate point on the graph.

I suddenly realized you can do both of these using the 
core functionality of the string variable code (now split out
as patchset #1043784).

Sample plots can be viewed at
	http://www.bmsc.washington.edu/people/merritt/gnuplot/stringvariables.html

User-specific point symbols
-------------------------------------

Simple example 
(equivalent to plot with points using "A" as a point style)
	plot "foo" using 1:2:"A" with labels

Snazzier example
	plot "foo" using 1:2:( ($2>$3) ? "J" : "D" ) with labels \
		font "WingDings"
 This one plots a smily-face at each point where col 2 is greater
than col 3, and a thumbs-down wherever col 2 is less than col 3.

Write coord pair on graph
-----------------------------------

	format = "[%.0f, %.0f]"
	coords(x,y) = sprintf( format, x, y )
	plot "foo" using 1:2:( coords($1,$2) ) with labels