Randomly select a number from a column of a stored matrix, stores the respective row

I am a novice MATLAB user, so please bear with me. I have a 256x5 double value stored, and the first column is just the numbers 0-255. The next 4 columns are a sequence of 4 numbers in a specific order.

I am trying to write a code that selects a number from Column 1 at random(0-255), and then subsequently saves the respective 4 element array/vector (of the row selected). How do you think I can accomplish this?

Answer 1

[Sky Sartorius]

You can use randi to randomly generate the index you need,

rowInd = randi(256,1);

then use that index to pull out the row from your matrix M:

fourElementVector = M(rowInd,2:end);

Of course this can also be done in one step:

M(randi(256,1),2:end);

[Akana Juliet]

You are a genius, works like a charm. Thank you so much!