# Simulate a random walk that starts at a certain time and then stops before the end of the simulation

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Bill Tubbs
on 16 May 2023

Commented: Bill Tubbs
on 18 May 2023

I want to simulate a white noise that begins at a certain time and then stops at another time before the end of the simulation. The goal is to generate a random-walk disturbance but I want to have a period at the beginning where the disturbance is zero and a final period where the disturbance is static.

Is this the best way or is there something simpler?

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Walter Roberson
on 16 May 2023

Edited: Walter Roberson
on 16 May 2023

You can use an if action block https://www.mathworks.com/help/simulink/slref/if.html as that permits you to use the & operator. So if time > 300 & time < 1000 ...

Or, use two relational operator blocks https://www.mathworks.com/help/simulink/slref/relationaloperator.html with their output type set as 'double', and multiply the two results, and multiply that by the output of the noise signal: the result will be 0 where either or both of the comparisons is false, and will otherwise be the noise.

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Walter Roberson
on 18 May 2023

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