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simulink random sequence generation

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amin re
amin re am 20 Jun. 2013
Hi,
I just created a "Malab function" block in simulink, and it generates random numbers. The problem now is that the sequence repeats whenever I run the simulation. The matlab function block simply looks like this function y=fcn() y=randn;
i know the seed should be reset but not sure how. Thanks

Antworten (3)

Kaustubha Govind
Kaustubha Govind am 20 Jun. 2013
According to the documentation for randn, you need to use the function rng to control the seed, etc. You may want to look into that.

Shashank Prasanna
Shashank Prasanna am 20 Jun. 2013
Bearbeitet: Shashank Prasanna am 20 Jun. 2013
Random numbers in all software are pseudorandom sequence of numbers. As Kaustubha already mentioned you will have to seed your random number generator differently if you don't want reproducibility (Which would be required if you want to run the simulation in the exact same way)
Include the following command at the very beginning of your matlabfunction block:
rng('shuffle')
This will choose a random seed every time.

amin re
amin re am 21 Jun. 2013
Bearbeitet: amin re am 21 Jun. 2013
Note that I'm using a matlab function block in a simulink, that doesn't work when I use rng shuffle in the function. so basically it looks like
function y=fcn()
rng shuffle
y=rndn
however i get this error The 'shuffle' input is only supported for Mex targets with the ExtrinsicCalls option.
  1 Kommentar
Kaustubha Govind
Kaustubha Govind am 21 Jun. 2013
Amin: Do you plan to generate standalone C/C++ code from your model? If not, you can call the function by declaring it extrinsic as the error suggests:
function y=fcn()
coder.extrinsic('rng');
rng('shuffle');
y=rndn;

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