Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: how to generate a gaussian distribution using random number generator
Replies: 3   Last Post: Jul 8, 2013 2:10 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
dpb

Posts: 8,289
Registered: 6/7/07
Re: how to generate a gaussian distribution using random number generator
Posted: Jul 3, 2013 8:40 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On 7/3/2013 6:52 PM, faraz.a wrote:
> i want to generate 50,000 samples according to the gaussian distribution
> using random number generator where sigma=1 and mean=0 X is a normally
> distributed random variable N(0,?2). mean=0 variance=1
>
> I did this R=randn(50000)
>
> i got an error
>
> Error using randn
> Out of memory. Type HELP MEMORY for your options.


doc randn

You tried to generate 50K x 50K array which is ~19 GB

> and if i am using R=randn(50000,1);
> hist(R)
>
> this generated a distribution but the y label was ranging from -4 to 5.
> I want it from -infinity to +infinity
> how to do that?


What's the probability of getting either extreme from a sample from a
standard normal distribution?

For that matter, what's the probability of |z|>5? How does that compare
w/ the size of the sample generated?

--




Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.