Create a random sequence with specified elements

Hi

Given the following vector

Q= [25 30 35 30 40 20 25 30]

I want to create a random vector S that contain the

Element 1, 25 times

Element 2, 30 times

Element 3, 35 times

Element 4, 30 times

Element 5, 40 times

Element 6, 20 times

Element 7, 25 times

Element 8, 30 times

such as

S= [1 8 3 4 5 6 7 8 1 2 3 5 7 4 2 2 5 7 ...]
    

The creation of S should be random. but the number of times an element is repetead should respect the quantity indicated in Q.

Answer 1

[madhan ravi]

s = repelem(1:numel(Q),Q);
S = s(randperm(numel(s)))