Sync cell arrays using unique

I have two cells GUD and GUDID, GUD is containing a 1x1000 double and GUDID contains a cell for every element in GUD.

I am calculating on GUD here. GUDID contains one ID number for every element in GUD

GUD={[2.56 3.23 1.22....]}
GUDID={173 178 180....}

for lol = 1:numel(GUD)
    GUD{lol}=unique(GUD{1,lol});
    %GUDID{lol}=...?
end

[Rik]

It is not clear to me what you question is or what you want to do.

One tiny speedup: as long as you avoid some classes (strings, tables, timetables, and more), you can use the legacy syntax:

idx = ~cellfun('isempty',GUD{lol});