I have a matrix something like this
1 1 ...2 1 ...3 1 ...1 2 ...2 2 ...3 2 ...1 3 ...2 3 ...3 3 ...I would like to arrange rows according to the first column, but I would like to hold the order for equal values, so I would like the following output
1 1 ...1 2 ...1 3 ...2 1 ...2 2 ...2 3 ...3 1 ...3 2 ...3 3 ...
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