How can I set automatically the textarrow position on a graph?

I would like to place the top of the arrow in a text-arrow annotation automatically on a plot, taking as reference a specific point of a line

Answer 1

[Oleg Komarov]

You will find this utility very useful: http://www.mathworks.co.uk/matlabcentral/fileexchange/10656-data-space-to-figure-units-conversion

It converts data units to normalized units which are required by the annotation() function.

plot(1:10);

% tail
[xt yt] = ds2nfu(3, 6);
% head
[xh yh] = ds2nfu(5, 5);

a = annotation('textarrow', [xt xh],[yt yh], 'String' , 'Straight Line');

Answer 2

[Azzi Abdelmalek]

annotation('textarrow',[x0,x1],[y0,y1],'String',yourtext);