How to get arrows on axes in MATLAB plot?

Question

I want to plot something like this:

x = 0:0.01:10;
f = @(x) 50* 1.6.^(-x-5);
g = @(x) 50* 1.6.^(+x-10);
plot(x, f(x));
hold on
plot(x, g(x));

I

Answer 1

The symbolic math toolbox has provisions for making these arrows, but without that toolbox you are stuck with drawing the arrows yourself. The following code should be useful for this purpose:

% determine position of the axes
axp = get(gca,'Position');

% determine startpoint and endpoint for the arrows 
xs=axp(1);
xe=axp(1)+axp(3)+0.04;
ys=axp(2);
ye=axp(2)+axp(4)+0.05;

% make the arrows
annotation('arrow', [xs xe],[ys ys]);
annotation('arrow', [xs xs],[ys ye]);

% remove old box and axes
box off
set(gca,'YTick',[])
set(gca,'XTick',[])
set(gca,'YColor',get(gca,'Color'))
set(gca,'XColor',get(gca,'Color'))

The only drawback is that for some figure window sizes you will have a 1-pixel white border below the arrows, and setting the LineWidth property of the axes to a ridiculous small value does not help.

But for printing, the small white border should not be relevant.