gnuplot documentation

60 PLOT gnuplot 4.3 79
Example:
file(n) = sprintf("dataset_%d.dat",n)
plot for [i=1:10] file(i) title sprintf("dataset %d",i)
This example defines a string-valued function that generates file names, and plots ten such files together.
The iteration variable (’i’ in this example) is treated as an integer, and may be used more than once. In
this example it is used both to generate a file name and a corresponding title.
Example:
list = "a b c foo baz"
item(n) = word(list,n)
plot for [i=1:words(list)] item[i].".dat" title item(i)
list = "new stuff"
replot
This example steps through a list and plots once per item. Because the items are retrieved dynamically,
you can change the list and then replot.
60.8 Title
A line title for each function and data set appears in the key, accompanied by a sample of the line and/or
symbol used to represent it. It can be changed by using the title option.
Syntax:
title "" | notitle [""]
where is the new title of the line and must be enclosed in quotes. The quotes will not be shown
in the key. A special character may be given as a backslash followed by its octal value ("\345"). The tab
character "\t" is understood. Note that backslash processing occurs only for strings enclosed in double
quotes — use single quotes to prevent such processing. The newline character "\n" is not processed in
key entries in either type of string.
The line title and sample can be omitted from the key by using the keyword notitle. A null title (title
’ ’) is equivalent to notitle. If only the sample is wanted, use one or more blanks (title ’ ’). If notitle
is followed by a string this string is ignored.
If key autotitles is set (which is the default) and neither title nor notitle are specified the line title is
the function name or the file name as it appears on the plot command. If it is a file name, any datafile
modifiers specified will be included in the default title.
The layout of the key itself (position, title justification, etc.) can be controlled by set key. Please see
set key (p. 106) for details.
Examples:
This plots y=x with the title ’x’:
plot x
This plots x squared with title "x^2" and file "data.1" with title "measured data":
plot x**2 title "x^2", ’data.1’ t "measured data"
This puts an untitled circular border around a polar graph:
set polar; plot my_function(t), 1 notitle
60.9 With
Functions and data may be displayed in one of a large number of styles. The with keyword provides
the means of selection.
Syntax: