How to separate specific data from an array in a new file?

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Matheus Brito
Matheus Brito 2020-8-7
回答： dpb 2020-8-7
Hello,
I have a doubt on how to separate different data from an array. For example: Each matrix has different number of rows and columns. In the first column of each matrix, the numbers 1, 2, and 3 always appear. How can I do to separate the data in a new file ??? containing only the data of the lines that have the number 1, that have the number 2 and that have the number 3 ???
Thanks and grateful for your help!

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dpb
dpb 2020-8-7
ia=ismember(data(:,1),[1:3]);
writematrix(data(ix,:))

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