select 2 rows in a (n,m) matrix

what command can be used to select 2 rows in a matrix(10,10),3 rows in a matrix(10,10),4 rows in a matrix (10,10)

Answer 1

[KL]

I suppose you want to randomly sample 1,2 or 3 rows from your matrix.

 A = rand(10); % example
 noRows = 1;
 A_sample = A(randperm(size(A,1),noRows),:);

Answer 2

[Torsten]

rowi = A(i,:);

selects the i'th row from the matrix A.

Does this help ?

Best wishes

Torsten.

[Rik]

This is the solution they should be looking for. And knowing that i can be a vector.