take selected rows from given matrix

22 Nov 2017
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Aggiornato 22 Nov 2017
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How can i take selected rows from given matrix??
For instance, let A = rand(100) and i want to take 10th,20th,30th ----100th row from A
Without using 'for' ( since i have to do many times, speed is important ), deriving is possible?? Help me!

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