Generate numbers randomly from a set?

Question

In MATLAB, I have a set of P numbers. I would like to generate a random array of size N from this set.

For the sake of example, let say I h

Answer 1

You should use datasample,

y = datasample(data,k) returns k observations sampled uniformly at random, with replacement, from the data in data.

a = [1,4];
datasample(a,5)

Depending on the usage, you might consider using,

datasample(unique(a),5)

Answer 2

If you don't have the Statistics Toolbox (which contains the datasample function), you can use randi:

N = 5; %// desired number of samples
data = [1 4]; %// data values
sample = data(randi(numel(data),1,N));

And if you use a very old version of Matlab that doesn't have randi, you can employ rand:

sample = data(ceil(numel(data)*rand(1,N)));