# Using a MATLAB function-block in Simulink to generate random numbers

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Niklas on 25 Jun 2014
Commented: A Jenkins on 25 Jun 2014
Hello!
I've tried to both google this question and search among the questions and answers here, but I've found no definitve answer to my question so I'm making a new one. Hopefully it won't be too much trouble!
I'm creating a simulation in Simulink where I have a "MATLAB function"-block that is supposed to take input from another source (we can consider this source a "Constant"-block) and then apply a random number that is generated from the MATLAB function-block on the input.
My problem is that I get the exact same randomized numbers every single time I run the Simulink simulation. And I was wondering if someone could help me solve my problem?
Here is the code (not all of it, but all of it that matters):
% function MC_output = randomizer(Stat_input)
%#codegen
minrand = 0.1;
maxrand = 1.9;
points = 10;
rand_numbers = Stat_input*minrand + rand(1, points).*(maxrand-minrand);
MC_output = mean(rand_numbers);
end
coder.extrinsic('rng');
rng('shuffle');
In different ways but with no success. Some help would be greatly appriciated! Oh, and btw, I'm using MATLAB R2012a.

A Jenkins on 25 Jun 2014
coder.extrinsic('rand')
to the beginning of your code.
##### 2 CommentsShowHide 1 older comment
A Jenkins on 25 Jun 2014
function MC_output = fcn(Stat_input)
coder.extrinsic('rng');
coder.extrinsic('rand')
rng('shuffle');
minrand = 0.1;
maxrand = 1.9;
points = 10;
z=zeros(1, points);
z=rand(1, points);
rand_numbers = Stat_input*minrand + z.*(maxrand-minrand);
MC_output = mean(rand_numbers);
end

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