how to generate vector by selecting from another vector?

There is a matrix, "a" that is n by 1. I need to generate another matrix with this size (n by r), by selecting randomly from "a". I need a function like unifrnd(min, max, [d f]), but selecting from another matrix. Would you please guide me in this regard?

Thanks in advance,

Mina

Answer 1

[Image Analyst]

Mina, try this:

% Create some sample input variable "a".
n = 1000;  % Whatever you want...
% Create sample data, or use some existing vector if you want
a = 1 : n;
% Now we have sample data and we can begin.

r = 10; % Whatever you want...
% Need an n-by-r output matrix, 
% so we need to pull n*r elements 
% from "a" at random locations.
indexes = randi(length(a), 1, n*r);
% Pull those indexes out and reshape them
% from a 1-D vector into an  n row-by-r column matrix.
out = reshape(a(indexes), n, r);

It's well commented so hopefully you can follow it but if you can't just ask.

[mina movahed]

Thank you so much, It's done.

Answer 2

[Azzi Abdelmalek]

%-----------Example-------------
n=10
r=4
A=randi(10,1,n)
%------The code----------
AA=sort(A)
a = AA(1);
bb=AA(2:end)
b=repmat(bb,r,1)
out = unifrnd(a,b)

[mina movahed]

Thanks for you response, I will try this.