hello all.I have a big problem. i have a 5*3 matrix.I want to eliminate rows that the third column related to it, is less than 3.how can I do this? I have no idea. thanks a lot

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for example:a=[1 2 3;4 3 2;1 4 6;8 3 0;2 4 1]; and the answer is: [1 2 3;1 4 6]

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Image Analyst
Image Analyst le 17 Juil 2016
Try this:
a=[1 2 3;4 3 2;1 4 6;8 3 0;2 4 1];
% and the answer is: [1 2 3;1 4 6]
% Find rows where the third column is less than 3.
rowsToDelete = a(:,3) < 3;
% Delete those rows.
a(rowsToDelete, :) = []
  3 commentaires
Image Analyst
Image Analyst le 17 Juil 2016
Yes. Let's say that rowsToDelete had 3 rows in it, but that you wanted to delete only the first and last one, and the second one you wanted to keep (not delete). So just delete the second element from rowsToDelete:
rowsToDelete(2) = []; % Don't delete row in second location.

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