Random number in a specific range
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Hello,,I wanna generate random numbers from range for example [-0.2,0.2] using matlab functions like randn or sth. thanks in advance.
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Accepted Answer
bym
on 13 May 2012
x = .4 * rand(100,1)-.2;
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Walter Roberson
on 14 May 2012
This answer is good if you want uniform distribution. If you want normal distribution then this answer will not work; see my Answer.
More Answers (2)
Oleg Komarov
on 13 May 2012
You can scroll down the documentation of randn for an example.
EDIT You don't even need to scroll down.
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Walter Roberson
on 14 May 2012
The closest I see in the randn documentation is for a given mean and standard deviation. Nothing about a given range. Not for randn.
http://www.mathworks.com/help/techdoc/ref/randn.html
Oleg Komarov
on 14 May 2012
Right, on the FEX there are contributions with random generators from truncated normal.
Walter Roberson
on 14 May 2012
It is not possible to construct a normal distribution over a restricted range. By definition a normal distribution must have an infinite tail in both directions.
If you need something that is much like a normal distribution but is defined over a limited range, then consider using a beta distribution.
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