MATLAB: How can i choose certain rows from a matrix

Question

i have a matrix (resulted from simulation) it contains 10000 row i want to make a new matrix from this matrix it contains only 1000 row (row number 10; row number 20; row number 30, …., row number 10000). how can i choose these rows?

Answer 1

A=rand(10000,3)  
out=A(10:10:10000,:)