how to select and save particulat part of a column in mat file?

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SimTec
SimTec 2021-8-24
编辑： Turlough Hughes 2021-8-24
I have saved a CSV file as mat file and I could read it. the file has many column and each column has thousands of rows.
How can I access and select particular column and sets of rows of these column and save it as matfile?
mydata=readmatrix('TEST.csv');

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Turlough Hughes
Turlough Hughes 2021-8-24
编辑：Turlough Hughes 2021-8-24
columns = [2 3 5];
rows = 50:100;
x = mydata(rows,columns);
save('mydata.mat','x')

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