Syntax:
title <text> | notitle [<ignored text>] title columnheader | title columnheader(N)
where 4#4text5#5 is a quoted string or an expression that evaluates to a string. The quotes will not be shown in the key.
There is also an option that will interpret the first entry in a column of
input data (i.e. the column header) as a text field, and use it as the key
title. See datastrings (p. ). This can be made the default by specifying
set key autotitle columnhead.
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. ) 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
Plot multiple columns of data, each of which contains its own title in the file
plot for [i=1:4] 'data' using i title columnhead