Time series analysis : data type and format

I everyone

After importing data, I would like to know how to declare a time series in Matlab.

I have tried as suggested in MATLAB here : https://www.youtube.com/watch?v=CsqtMGDnMBw

But I received this error:

Here is the screen of my dataset in Excel attached (Annual data on GDP from 1973 to 2022) :

Thank you in advance for your helpful feedback.

Regards,

Daniel D.

[Dyuman Joshi]

What do you mean by "define a time series"?

[Daniel DEKASSE]

As we declare a dataset in STATA as a time series, sorry for not being specific.

[Stephen23]

"I have tried as suggested in MATLAB here ... But I received this error"

The MATLAB function EXTRACTBEFORE requires two inputs, as its documentation shows:

https://www.mathworks.com/help/matlab/ref/extractbefore.html

What do you expect to occur if you call it with only one input?

"After importing data, I would like to know how to declare a time series in Matlab."

Rather than doing that you should probably try to import the data as a timetable:

https://www.mathworks.com/help/matlab/timetables.html

For example using:

https://www.mathworks.com/help/matlab/ref/readtimetable.html

[Dyuman Joshi]

"I have tried as suggested in MATLAB here"

The format of data used in the video is different than yours. You don't need to use extractBefore().

Simply read the data using readtimetable as @Stephen23 has mentioned above.

[Daniel DEKASSE]

Thank you very much.

[Daniel DEKASSE]

Thank you @Stephen23