Extract Data from Timetable

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Hi, i have a daytime Matrix and i also have a second timetable of 2 columns (first Time, second Data) of dates from which i want to extract for each daytime of the first Matrix the Data that refers to this Date fromthe second one!
Is there an easy way, without using a for loop, to do so?
  10 Comments
Peter Perkins
Peter Perkins on 4 Jun 2018
Ioannis, I'm pretty sure every loop in your code is unnecessary. For example:
y = NaT(somePreallocationSize);
i = isbetween(x-calyears(1),down,up);
y(i,5) = t(i,5);
I can't really follow everything that's in your code, but that's the idea. This will run MUCH faster and is much simpler to write and maintain.
Ioannis Tsikriteas
Ioannis Tsikriteas on 4 Jun 2018
Thank's a lot. You know...i am not as experienced in Matlab as you are. I wanted to add and to substract also to my dates 5 years. Indeed it was slow to execute all these loops but eventually it was a succesful attempt

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Accepted Answer

Paolo
Paolo on 2 Jun 2018
Edited: Paolo on 2 Jun 2018
This example will help you.
A datetime matrix:
daytimemat = datetime(['13/04/2018';'25/04/2018';'28/04/2018'],'Format','dd/MM/yyyy');
A timetable with dates and data.
tt = timetable(datetime({'13/04/2018';'25/04/2018';'26/04/2018';'28/04/2018'}), [37.3;39.1;42.3;21]);
The following command:
%Use the index for which tt.Time and daytimemat are equal to find data.
tt.Var1(tt.Time(daytimemat))
outputs :
37.3000
39.1000
21.0000
which is the data contained in the timetable tt corresponding to the dates in daytimemat array.

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