using function to remove elements from a large matrix

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I need to code for a matrix in which the rows are removed given thier value in a certain column is not of desire to me. eg, I want to keep the numbers 1 2 3 and 11 and 12 but not 4 5 6 or 13 14 etc.

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the cyclist
the cyclist il 25 Dic 2019
Modificato: the cyclist il 25 Dic 2019
idxToKeep = ismember(M(:,2),[1,2,3,11,12]);
M = M(idxToKeep,:);

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