Can I random select

Can I random select the amount of data from the matrix dataset that can specify the number of rows. example

 A=[1 2 3 4; 
   5 6 7 8; 
   9 10 11 12; 
   13 14 15 16; 
   17 18 19 20];

I want to random

training_dataset= [1 2 3 4; 
                   13 14 15 16;
                   5 6 7 8;];

and

   testing_dataset= [ 9 10 11 12; 
                    17 18 19 20];

I'm not sure it can be random which is not overlapping?

Thank you so much