How can I extract rows using column values?
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I'm trying to use the emnist byclass data set which includes digits and upper/lower case letters. I don't need all of the letters so I wanted to remove the unnecessary ones. The emnist set uses the first column as a label 0-61 and only need for example 0-9 and <49, 55, 11, 32, 13, 29, 30, 20, 33, 43, 24> these ones.

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Accepted Answer
Walter Roberson
on 22 May 2022
classes_needed = [49, 55, 11, 32, 13, 29, 30, 20, 33, 43, 24];
mask = ismember(emnist(:,1), classes_needed);
subset = emnist(mask,:);
More Answers (1)
MJFcoNaN
on 22 May 2022
% random matrix
A=randi(50,10)
% needed lines index
ind=ismember(A(:,1), [0:9, 49, 55, 11, 32, 13, 29, 30, 20, 33, 43, 24]);
% needed rows
B=A(ind, :)
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