MATLAB: Help random numbers generator

randnrandom number generator

Hi everyone, I'd like to know how to generate a set of random numbers with normal distribution (randn) belonging to a range defined by me.

To make it easier:

I want to generate 10 random numbers between [-0.5 0.5] using randn.

Thanks for your attention

Best Answer

Good. Here it is as an 'official' answer:

pd = makedist('Normal');
t = truncate(pd,-0.5,0.5);
r = random(t,10,1);

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Such as randn() ? Or one of the random distribution tools in the Statistics Toolbox ?

MATLAB: How to generate a random number with normal distribution

This is called a truncated distribution. While you are correct that it is no longer strictly a normal distribution (that extends to infinity to either side of the mean), you can nevertheless define it. The extended discussion is in the truncate (link) documentation section in Truncate a Probability Distribution (link).

For your Question, this would be:

pd = makedist('Normal')
t = truncate(pd,-10,10)
r = random(t,10000,1);

Experiment to get the result you want.

Best Answer

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