Gnuplot Manual: Title, key title, and lable

Outline:

Title, key title, and lable

Title

In order to make a title for a plot,

gnuplot> set title "Exponential Function"
gnuplot> plot exp(x)

In order to change the font, type as follows:

gnuplot> set title font "Helvetica,14"
gnuplot> plot exp(x)

The value, 14, is the size of the font. gnuplot hirophysics

Key Title

If you have several functions to plot and put a title for the entire keys, use "key title." Let's try some example. There are two functions, sin(x) and cos(x). Then, the key title can be "Trigonometric Functions."

gnuplot> set key title "Trigonometric Functions"
gnuplot> plot sin(x), cos(x)

If you want to rename the key it self, the instruction is provided here.

Lable

For labels of each axis, you have the command as follows:

gnuplot> set xlabel "Time"
gnuplot> set ylabel "Growth"
gnuplot> plot exp(x)

Arrow

An arrow can be displayed in the graph to indicate a place to note. The values of coordinate must be based on the plot ranges as default. Let's give an example:

gnuplot> set label 'Minimum point' at 0.5,-0.35
gnuplot> set arrow from 1.5,-0.3 to 4,-0.22
gnuplot> plot sin(x)/x

Note that you can undo them by "unset arrow" and "unset label."

Gnuplot manual: Frequently used methods