Is there a way to generate unique random number in Simevents?

I am currently working with Queueing Network model using Simevents. Each server has service time, and I am using rand and randn to generate random service time for each server (for ex, -1 * 0.22 * log(1 - rand()) + 0.13 or 0.3+0.1*randn). I realized that most of the entity's service time are the same. I have tried generating seed, but it's still the same service time. I have followed

https://www.mathworks.com/matlabcentral/answers/334395-how-to-create-random-seed-to-have-different-results-at-each-simevents-run

https://www.mathworks.com/help/matlab/math/generate-random-numbers-that-are-different.html

these two documents, but the result are the same (I also used rng('shuffle'), but still doesn't work)

Is there a way to generate unique random number using rand() and randn() other than the methods I used in simevents? Thank you.

Answer 1

[Brahmadev]

Hi,

I understand that you would like to generate random numbers using Entity Generator. The following code as the "Intergeneration time action" should give different results on each simulation.

% coder.extrinsic is used to make sure that all interactions with the 
% random number generator (RNG) and rand() are executed outside of Simulink 
coder.extrinsic("rng"); 
rng('shuffle');
coder.extrinsic("rand");
% You need to explicitly mention the type for the variable that is receiving values 
% from a function declared as coder.extrinsic. If not, MATLAB will return value of type mxArray. 
newValue = double(0); 
newValue = rand();
disp(newValue);
dt = -1*0.22*log(1-rand()) + 0.13 ; % Values generated at random service time

Hope this helps!