How to generate Zero mean and unit variance
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Dick Rusell
on 18 Sep 2014
Commented: the cyclist
on 19 Feb 2021
I'm not sure how to generate 1024 samples of pseudo random numbers with zero mean and unit variance using rand and to verify the results with mean, std, and hist.
2 Comments
Accepted Answer
Roger Stafford
on 18 Sep 2014
Edited: Roger Stafford
on 18 Sep 2014
If you want a uniform distribution do this:
n = 1024;
x = sqrt(3)*(2*rand(n,1)-1);
The random variable x will have a statistical mean of 0 and variance of 1. Of course any given n-element sample will deviate from these. These are only the statistically expected values.
2 Comments
Marius Hernes Brateng
on 20 Oct 2020
this comes from the definition of variance. Solve this equation for a, get a = sqrt(3).
More Answers (2)
the cyclist
on 18 Sep 2014
Edited: the cyclist
on 18 Sep 2014
randn(1024,1)
will generate 1,024 normally distributed values from a population with zero mean and unit variance.
3 Comments
soumya dwibedy
on 16 Feb 2021
how to generate 1000 normally distributed values with (2 7 )mean and unit variance
the cyclist
on 19 Feb 2021
It's usually better to post a new question, than a comment on a 6-year-old one (even though this is related). People won't typically see a comment buried in an old post. It was just lucky that I did.
I don't understand what you mean by "(2 7)mean". Did you you mean just "27"?
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