Two Matlab Function Blocks generate the same random number

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Benjamin Krüger 2018-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/375976-two-matlab-function-blocks-generate-the-same-random-number

回答： Manan Mishra 2018-1-10

In Simulink, I'm using a Matlab function block to generate Gaussian-distributed numbers at each time step. If I make a copy of that block and run it in parralel to the first one, it generates the same random number (instead of an independent one as actually wanted). A quick-and-dirty solution for this problem is to generate a random vector (in this example with a length of two) and let each block pick one element, but I'm wondering if there is a more elegant way to do it?

Thanks for your help!

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Answer 1

Manan Mishra 2018-1-10

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You can use different seeds in your MATLAB function blocks to get different random numbers as output. Look at the following documentation for more information regarding this:

Control random number generation

You can include something like this in your MATLAB functions before calling the random number generator function:

In block 1:

>> rng(1)

In block 2:

>> rng(2)