MATLAB: Permanently set "Text Update Function" for Data Cursor in figures

Question

Problem: I use MATLAB for science, and I often need more than 4 significant digits. Every time I use Data Cursor in a figure's GUI, I need to manually right-click on the point, Select Text Update Function... or Edit Text Update Function..., and navigate to the folder where I saved the function whose callback prints more than 4 (e.g. 8) significant figures. This is annoying and there should be a way to automatically change this.

Ideal answer: I want this done permanently for all figures, e.g. in a function that changes default settings in my startup.m file.

Good enough answer: I want a wrapped function to which I give the figure handle and it fixes this for me.

I humbly await SO's infinite wisdom.

Answer 1

The permanent solution

would be, to edit the default_getDatatipText.m function. You can find it in:

C:\...\MATLAB\R20xxx\toolbox\matlab\graphics\@graphics\@datacursor

There you will find the line:

DEFAULT_DIGITS = 4;  % Display 4 digits of x,y position

Edit it as desired, you can't do much harm, but make a backup before if you want.

Alternative solution:

There is also the possibility of custom data tips: Tutorial at Matlab Central

It could finally look like this:

(additional text outside data-tips was post-processed)

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And as you're talking about precision. The data-tip always snaps to the closest data-point. It doesn't show interpolated data at the clicked position.