How to generate Zero mean and unit variance
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Dick Rusell
le 18 Sep 2014
Commenté : the cyclist
le 19 Fév 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.
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Réponse acceptée
Roger Stafford
le 18 Sep 2014
Modifié(e) : Roger Stafford
le 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 commentaires
Marius Hernes Brateng
le 20 Oct 2020
this comes from the definition of variance. Solve this equation for a, get a = sqrt(3).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/386298/image.png)
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the cyclist
le 18 Sep 2014
Modifié(e) : the cyclist
le 18 Sep 2014
randn(1024,1)
will generate 1,024 normally distributed values from a population with zero mean and unit variance.
3 commentaires
soumya dwibedy
le 16 Fév 2021
how to generate 1000 normally distributed values with (2 7 )mean and unit variance
the cyclist
le 19 Fév 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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