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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fariba amini
fariba amini 2016-7-17
评论： fariba amini 2016-7-17
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 2016-7-17
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, :) = []
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Image Analyst
Image Analyst 2016-7-17
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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