How to randomly select 2 rows

Hi

I want to randomly select 2 rows of a matrix

The matrix may have an odd number of rows

How to randomly select these 2 rows

for example

Random numbers are inside the variable B

Select the rows accordingly with the numbers in the random variable

B=randperm(19)

No duplicate rows

In other words, if a row is selected, it will no longer be selected

Thanks for your guidance

Answer 1

[Ameer Hamza]

You can use the output of randperm as index

M = rand(10, 5); % random matrix
rows = randperm(size(M,1), 2)
M_new = M(rows, :)

Answer 2

[Andreas Bernatzky]

This would be my solution:

myMat = rand(10,50);
[nRow,~] = size(myMat);
randomRows = round((nRow - 1).*rand(2,1) + 1); % from 1 to nRow

firstRandomRow = myMat(randomRows(1),:);
secondRandomRow = myMat(randomRows(2),:);