How to plot arrow with data coordinates in Matlab?

Question

I know there is a function named annotation can plot arrows or double arrows. But annotation can only plot in normalized unit. For example:

annotation(\'arro         


        

Answer 1

I've just discovered this method, since I don't want to have to bother with normalised units. Use the latex interpreter:

figure
plot([1:5],[1:5]*3,'.-')
%// Say I want to put an arrow pointing to the location, [3 9]    
text(2.94,8.3,'\uparrow','fontsize',20)
text(2.8,7.8,'point [3,9]')

To make the arrow longer, use a larger fontsize.

Pros

• Easier, faster and quicker than using normalised units
• Don't need to install any functions (good for us lazy people..)
• making use of the LaTeX interpreter, there is a whole range of arrows (up, down, left, right and other angles (see Symbol list)

Cons

• Definitely needs trial and error/tweaking to get the correct location of the arrow head relative to the POI.
• There is limited control over the length of the arrow
• Some latex commands aren't understood by the interpreter (boo).