How do I isolate certain portions of my data in a time series?

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Sorry, I am new ot MatLab and I have a 429x18 array measuring 18 different parameters - one of those being downwelling shortwave radiation. I need to isolate any data in the time series with shortwave downwelling >20 Wm-2. My professor mentions using "ii=find(Rsw>20)" to find the indices ii I am looking for, but I am having a hard time actually typing this into MatLab in the correct format it seems.
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Mathieu NOE
Mathieu NOE 2020년 10월 19일
have you looked at the help (type help find in the command window)

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Prudhvi Peddagoni
Prudhvi Peddagoni 2020년 10월 21일
there is a way to extract elements from the matrix based on some predefined conditions.
please refer this answer for the steps to do this.
Hope this helps.

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