From: Mike on
"Mike " <michael.moselle(a)ngc.com> wrote in message <hiicog$pjg$1(a)fred.mathworks.com>...
> There have been some requests on how to modify the Data Tip precision when you need more decimal places while inspecting plots. The best option to make the default precision change permanently is to modify the 'default_getDatatipText.m' file. On line 31 change the
> DEFAULT_DIGITS = 4;
> to whatever precision you want. Save and this will always be the precision that will be displayed. Happy plotting.

P.S. The file 'defualt_getDatatipText.m' is located in in your Matlab \toolbox\matlab\graphics\@graphics\@datacursor directory.