Time series analysis : data type and format
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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.
6 个评论
Dyuman Joshi
2023-9-12
What do you mean by "define a time series"?
Daniel DEKASSE
2023-9-12
编辑：Daniel DEKASSE
2023-9-12
"I have tried as suggested in MATLAB here ... But I received this error"
The MATLAB function EXTRACTBEFORE requires two inputs, as its documentation shows:
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:
For example using:
Dyuman Joshi
2023-9-12
"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().
Daniel DEKASSE
2023-9-12
Daniel DEKASSE
2023-9-12
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