Probably something like
isfixed=contains(tt.assets,'fixedinc'); % if string or cell string, should locate
tt(isfixed,:) % will display what was selected
Likely the assets data could effectively be a categorical variable--
tt.assets=categorical(tt.assets); % convert to categorical type
isfixed=(tt.assets=='fixedinc'); % the logical index array w/ categorical type
tt above is, of course, the timetable--use whatever you named yours in place.
Above is purely speculative on the assumption of what the timetable variables actually are which you've not given any real informtion on.
