dear all:I have a 6* 3 matrix. I wanna choose 4rows randomly. how can I selecete all array in a rows randomly without replacement?

for example:

A=[1 2 3;2 3 5;6 4 1;8 6 0;2 4 1;1 4 7;8 4 2];

and the answer is:

[1 2 3;6 4 1;8 6 0;8 4 2];

Answer 1

[Azzi Abdelmalek]

A=[1 2 3;2 3 5;6 4 1;8 6 0;2 4 1;1 4 7;8 4 2]
B=A(randperm(6,4),:)

[fariba amini]

thanks a lot

[fariba amini]

in this way rows have replacement,I want to have matrix B without replacement.can you please tell me what should I do then?

[Azzi Abdelmalek]

idx=sort(randperm(6,4))
B=A(idx,:)

[fariba amini]

thanks a lot. it works.thanks again