This command adds a label to the x-axis of the plot. The general syntax for its use is
xlabel('label')
or in the alternate form
xlabel 'label'
or simply
xlabel label
Here label is a string variable.
Here is an example of a simple plot with a label on the x-axis.
--> x = linspace(-1,1);
--> y = cos(2*pi*x);
--> plot(x,y,'r-');
--> xlabel('time');
which results in the following plot.