From: Yaser Martinez Palenzuela on
Lets say you have 3D data, then make a 3D plot with this data, and now you want to place an arrow pointing at one(or some) of this 3D points. Normally you would use the command annotation. Annotation requires a 2D vector in figure normalized coordinates. How to convert between 'real' 3D data and data rendered in 2D by Matlab? It would be something like 'dsxy2figxy' but for 3D dimensions.
Thanks
elYase