take selected rows from given matrix

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!

Answer 1

[Andrei Bobrov]

out = A(10:10:end,:);

Answer 2

[Birdman]

A(10:10:100,:)

[JaeSung Choi]

thanks!!