How to randomly select variable from the range of numbers ?

Hi,

I have a variable

a=[1:1:100]

I would like to select from the variable a , 5 values randomnly every time. Eg 10 15 67 89 99.

Is there any way to do it in simple rather than using a for loop.

Appreciate the help

Answer 1

[Azzi Abdelmalek]

 a=[1:1:100]
 out=a(randi(100,1,5))

[Wayne King]

@Azzi Abdelmalek

with randi() you can get repeated values so you might get elements of the vector, a, repeated by having the same index more than once.

[Azzi Abdelmalek]

out =

    58     8     6    31    53

out =

    57    25    92    83    45

I don't get what you mean

[Azzi Abdelmalek]

ok, but he did'nt say that a number can't be repeated

[Azzi Abdelmalek]

in case it can't be repeated

 [~,idx]=sort(rand(1,100))
 out=a(idx(1:5))

[Karthik KJ]

Thank you

Answer 2

[Andrei Bobrov]

a = 1:100;
ii = randperm(numel(a));
out = a(ii(1:5));

or

[ii,ii] = sort(rand(1,numel(a)));
out = a(ii(1:5));

or

out = a(randperm(numel(a),5));

Answer 3

[Wayne King]

   idx = randperm(length(a));
   idx = idx(1:5);
   a(idx)

or if you have the newest version of MATLAB

    idx = randperm(length(a),5);
    a(idx)