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Re: [Help-gsl] Re: Random number generation

From: Carl Boettiger
Subject: Re: [Help-gsl] Re: Random number generation
Date: Tue, 5 May 2009 17:43:17 -0700

The number shouldn't be close to zero.  Divide by 600 and you'll have
the mean, which will be close to zero.  Just sum a bunch of gaussian
random numbers of standard deviation sigma and you expect a
displacement of sqrt(2 sigma T), i.e. sqrt(1200) approx 34 -- you're
simulating Brownian motion.


On Tue, May 5, 2009 at 2:10 PM, Rodney Sparapani <address@hidden> wrote:
> Vibhuti Dave wrote:
>> Hello,
>> I have attached the code that I am using to generate random numbers that
>> have a Gaussian distribution with a mean value of 0.
>> Ideally, if I generate these numbers and sum them up, the sum should be
>> very
>> close to 0 since it is a gaussian ditribution. I am using the function
>> gsl_ran_gaussian to generate them. However, the mean value seems to be way
>> off 0 when I run the program.
>> Any idea why that might be happening?
>> Thanks
>> Vibhuti
> What happens if you set mu = 0.?
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Carl Boettiger
Population Biology, UC Davis

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