Which are the simplest plot commands in Matlab?

If you are trying to simply plot data points, or a line connecting data points, I find "plot" to be fairly simple, although you can get fancy with it. For example:

x = 1:10; % Or whatever x-values

y = 2:20; % Or whatever

plot(x,y)

If you would like to plot a function instead, you can still use "plot":

x = -pi:pi/8:pi;

y = sin(x);

plot(x,y)

But a lot of people like using "ezplot" for that:

ezplot('sin(x)')

Also, if you create the data in the Command Window, you can select the variables in the Workspace Browser and plot them using the "PLOT" tab options.