Extract data from a timetable excluding an specific date

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Angelavtc
Angelavtc on 20 Feb 2021
Answered: J. Alex Lee on 20 Feb 2021
Hello!
I have two timetables. In the first one (tt_1) I have dates and a variable (v1). From this timetable I want to extract the dates where the variable is less than 12.5.
Then I want to filter my second timetable (tt) from these dates. This means, I want to create a new timetable (tt_2) with only the information from tt excluding the dates selected tt_1.
An example would be to get to table tt_2 from tt_1 and tt.
tt_1 = timetable(datetime({'13/04/2018';'25/04/2018';'28/04/2018'}), [12;12.5;10]);
tt = timetable(datetime({'13/04/2018';'25/04/2018';'26/04/2018';'28/04/2018'}), [37.3;39.1;42.3;21]);
tt_2 = timetable(datetime({'25/04/2018';'26/04/2018'}), [39.1;42.3]);
Any ideas? I would be very grateful.
Thanks

Accepted Answer

J. Alex Lee
J. Alex Lee on 20 Feb 2021
This should work. Most of these steps should be straightforward..."ismember" may have been the key
tt_1 = timetable(datetime({'13/04/2018';'25/04/2018';'28/04/2018'}), [12;12.5;10]);
tt = timetable(datetime({'13/04/2018';'25/04/2018';'26/04/2018';'28/04/2018'}), [37.3;39.1;42.3;21]);
tt_2_ref = timetable(datetime({'25/04/2018';'26/04/2018'}), [39.1;42.3]);
% find rows in tt_1 satisfying criterion on variable
vflt = tt_1.Var1 < 12.5
% find corresponding dates in tt_1
texcl = tt_1.Time(vflt)
% find rows where times in tt are not in texcl
tflt = ~ismember(tt.Time,texcl)
% extract filtered rows from tt
tt_2 = tt(tflt,:)
% check against ref
isequal(tt_2,tt_2_ref)

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