Simulink random number repeats every time the simulation runs

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Max
Max 2011-5-30
Hi,
In Simulink, using RTW, I need to generate a random number in the [1,3] range and i need the number to be different every simulation. Is there any comand to generate a random seed and not get the same seed every simulation that does not involve using extrinsic functions?
Thanks in advance!

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回答（2 个）

Jan
Jan 2011-5-30
Seed the random number generator in the InitFcn:
RandStream.setDefaultStream( ...
RandStream('mt19937ar', 'seed', sum(100 * clock))
Actually it should be enough to do this once in a Matlab session. Therefore I assume a PERSISTENT variable might be helpful:
persistent Seeded
if isempty(Seeded)
... the above seeding code
Seeded = true;
end
Paulo Silva
Paulo Silva 2011-5-30
Go to File, Model Properties, callbacks, InitFcn
n=randi([1 3])
if you don't wan't to have repeated n values, first check if n exists in the workspace, if it exist get it's value and generate n values until they are diferent (while (n0==n) generate another n)
if ismember('n',who) %check if there's already one n value in memory
n0=n; %there's one, save it to n0
while (n0==n) %get another n diferent from n0
n=randi([1 3]);
end
else
n=randi([1 3]); %there's no n in memory get one
end
The code can fail if there's one n in memory that's not a number, use a variable with a big and/or unique name or add code to handle that situation.

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