Add variables from one timetable to another

Having a bit of trouble with this...

I've got two timetables. Let's call them TT1 and TT2.

One table (TT1) has 11 variables. Another table (TT2) has 1035 variables. They are the same length.

I would like to take variables 12:1035 and move them to the right of the last variable in TT1.

What is the best approach?

[VBBV]

Read this link

https://in.mathworks.com/help/matlab/matlab_prog/create-timetables.html

Try using synchronize function as given in help link above.

[Eric Escoto]

I can't see how the synchronize function would work for me.

If I try a code like such:

TT_test = timetable(tmin, TT2{:, [12:1035]});    % Pull columns of interest from TT2 and use tmin as the datetime vector.

Then I wind up with only one variable and not the 1024 variables I want.

[Eric Escoto]

What I'm trying to show is my indexing isnt correct and I'm not pulling each variable seperately. The result of this syntax is that there is only a single 'var1' with 1024 collumns instead of 1024 vars.

Answer 1

[LeoAiE]

Hi,

I think you could easily achieve that using outerjoin function. First, extract your data from TT2 and give it a name such as NewTable = TT2(12:1035). Then, use outerjoin function to merge them

FinalTable = outerjoin(TT1,NewTable).

Please see the documentation of this function and how to use it examples https://www.mathworks.com/help/matlab/ref/outerjoin.html

And if you find this helpful, make sure to accept the solution!

Thanks

Answer 2

[Peter Perkins]

Eric, I think all you need is

>> T1 = array2table(rand(5,3),"VariableNames",["A" "B" "C"]);
>> T2 = array2table(rand(5,3),"VariableNames",["X" "Y" "Z"]);
>> T12 = [T1 T2(:,["Y" "Z"])]
T12 =
5×5 table
A          B          C          Y          Z   
_______    _______    _______    _______    _______
0.48976    0.27603    0.49836    0.95929    0.84072
0.44559     0.6797    0.95974    0.54722    0.25428
0.64631     0.6551    0.34039    0.13862    0.81428
0.70936    0.16261    0.58527    0.14929    0.24352
0.75469      0.119    0.22381    0.25751    0.92926

You will need to make sure you don't have variable name conflicts.

The join functions are sort of a horz cat when you want to match up rows based on their values, not their positions. synchronize is sort of a horz cat whn you want to match up rows (of timetables) based on their times.

[Eric Escoto]

The issue is that there are 1024 variable names. There's got to be a better way then to just type in each one?

[Eric Escoto]

Plus, I know I've done this before and am scouring some old scripts but am at the point of just seeing gibbersish in my code. Long week.

[Peter Perkins]

T12 = [T1 T2(:,12:1035)]?