A small correction, the result of the randn command should be multiplied
by
the square root of the desired variance (i.e. multiply with the standard
deviation).
-Deepak
-
To know that we know what we know, and that we do not know what we do not
know, that is true knowledge.
- Confucius (551-479 B.C.).
-
----- Original Message -----
From: "Juan I. Arvelo, Jr., Ph.D." <>
To: "Rene Bartar" <>; "matlab" <>
Sent: Monday, July 05, 2004 8:05 PM
Subject: Re: [matlab] randn command
> Multiply it's results by the variance that
you want.
>
> --- Rene Bartar <> wrote:
> > This command generates a normaly distributed random
> > number with zero mean and variance equals to 1. How
> > do
> > I modify the variance of the command?
> >
> > thanks
> > Rene Bartar
> >
> >
>
__________________________________________________________________________
> > Acabe com aquelas janelinhas que pulam na sua tela.
> > AntiPop-up UOL - gris!
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> >
> >
> >
> >
>
> =====
> Juan I. Arvelo, Jr., Ph.D.
> Johns Hopkins University
> 11100 Johns Hopkins Rd.
> Laurel, MD 20723
> 240.228.4293
>
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Reply by mary guo●July 5, 20042004-07-05
Rene,
You first run randn()command to obtain the random sequency with zero
mean and variance = 1, then multiply this sequence by the square root of
the variance, which gives the desired output.
Rene Bartar
<r...@bol.com.br> wrote:
This command generates a normaly distributed
random number with zero mean and variance equals to 1. How do I
modify the variance of the command?
thanks Rene Bartar
__________________________________________________________________________ Acabe com aquelas janelinhas que pulam na sua tela. AntiPop-up UOL - gris! http://antipopup.uol.com.br/
_____________________________________ Note: If you do a simple
"reply" with your email client, only the author of this message will receive
your answer. You need to do a "reply all" if you want your answer to be
distributed to the entire group.
_____________________________________ About this discussion group:
Reply by Juan I. Arvelo, Jr., Ph.D.●July 5, 20042004-07-05
Multiply it's results by the variance that you want.
--- Rene Bartar <> wrote: > This command generates a normaly distributed
random
> number with zero mean and variance equals to 1. How
> do
> I modify the variance of the command?
>
> thanks
> Rene Bartar
__________________________________________________________________________ > Acabe com aquelas janelinhas que pulam na sua
tela.
> AntiPop-up UOL - gris!
> http://antipopup.uol.com.br/
>
>
=====
Juan I. Arvelo, Jr., Ph.D.
Johns Hopkins University
11100 Johns Hopkins Rd.
Laurel, MD 20723
240.228.4293
__________________________________
Reply by Manish Bajpai●July 5, 20042004-07-05
You have to do following
transformation:
x = sigma*x' + mu;
the new random variable x' will have the
required mean and variance.
Warm Regards,
Manish
----- Original Message -----
From: Rene Bartar
To: matlab
Sent: Monday, July 05, 2004 2:29 AM
Subject: [matlab] randn command
This command generates a normaly distributed random number with zero mean and variance equals to 1. How do I modify the
variance of the command?
thanks Rene Bartar
Reply by Rene Bartar●July 4, 20042004-07-04
This command generates a normaly distributed random
number with zero mean and variance equals to 1. How do
I modify the variance of the command?
thanks
Rene Bartar
__________________________________________________________________________
Acabe com aquelas janelinhas que pulam na sua tela.
AntiPop-up UOL - gris! http://antipopup.uol.com.br/