how to set title below a graph in gnuplot

Question

example:

set title "title"
plot x

This will draw a graph with a title on the top. I want to move the title under the graph. What should I do? More, how about the same problem in multiplot. I want to move the titles for every small graph s under each graph. NOTE that the title is not the title in a plot which will be placed in the keys. Many thanks!

Answer 1

The advantage of using set title is, that some vertical space is automatically reserved for it. This works only when placing the title above the graph.

You can place it below the graph only by specifying an offset. But in this case you must adapt both the offset manually and also the bottom margin:

Consider the following example:

set multiplot layout 1,3

set title "title"
plot x

set title "positive offset" offset 0,1
plot x

set title "negative offset" offset 0,-2
plot x

unset multiplot

As soon as you have a too large negative offset, the top margin is reset as if you would have not title, but the bottom margin remains unchanged.

So you must set a label manually below the plots and adapt the bottom margin accordingly:

set multiplot layout 1,3

set xlabel "xlabel"
set label 11 center at graph 0.5,char 1 "first title" font ",14"
set bmargin 5
plot x

set label 11 "second title"
plot x

set label 11 "third title"
plot x

unset multiplot

In any case you need manual intervention and tweaking of the margins.