hi, i have set of numbers as following :

Z=[1,5,7,4,3,6,77,88,34,73,58,97,23,55,30,49,86,76,64,64,54,54,65,76,76,62,83,59,62,57,48]; How to choose 10 random numbers from these numbers??

[Star Strider]

Essential duplicate of: i have the following array

Answer 1

[Walter Roberson]

Z(randperm(length(Z),10))

[Jan]

Or if repetitions are wanted:

Z(randi([1, length(Z)], 1, 10))

[mohammed elmenshawy]

No . I want to randomly select from the previous numbers and not from the length of the Z array? when apply this code, show the following

[Adam]

You didn't use the code correctly. You don't assign it to Z, you index into Z.

[Walter Roberson]

Breaking it up into steps:

random_index = randperm(length(Z));
Z(random_index(1:10))

That is, you start by taking a random permutation of the 31 possible indices into Z. Then you take 10 of those, so you get 10 unique indices into Z. Then you index Z at those locations to have chosen 10 random elements without replacement.

The code

Z(randperm(length(Z),10))

does this in one step.

[Jan]

@mohammed: You do not need:

Z = (randperm(length(Z), 10));

but:

SelectedZ = Z(randperm(length(Z), 10));