R help - Apr 2013 - Bls: RE: example

Dear Sir,
Yes, I want to generate the data by two Gaussian but mean from one of them
generatated from polar its coordinates. I am confused about the algorithm? I
know how to generate two Gaussian data with certain mean&covariance matrix
using mvnorm but what about mean from its polar coordinates?
Thanks for your help.

Best wishes,

Iut
------Pesan Asli------
Dari: John Kane
Ke: Iut Tri Utami
Ke: r-help at r-project.org
Perihal: RE: [R] example
Terkirim: 27 Apr 2013 8:19 PM

https://github.com/hadley/devtools/wiki/Reproducibility
 http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

It is not clear what you want.  Do you need to generate the data or do something
with existing data?

John Kane
Kingston ON Canada

> -----Original Message-----
> From: triutami.iut at gmail.com
> Sent: Sat, 27 Apr 2013 01:38:23 +0700
> To: r-help at r-project.org
> Subject: [R] example
> 
> Dear Sir,
> My name is Iut Tri Utami. i am beginning user.  I have a problem about
> generate data in R. It consists of one disk generated by a Gaussian N(0,
> 0.167) and one ring generated by a Gaussian N(R, 0.1). The mean R was
> generated from its polar coordinates. The angle was drawn from a uniform
> distribution on the interval (0, 2p), and the radius, from a Gaussian
> N(1.5, 0.1). The class sizes are 500 and 2000.
> 
> 
> Thank you very much for your attention and, I wish that you will help me.
> 
> Best wishes ,
> 
> Iut Tri Utami
> 
> 	[[alternative HTML version deleted]]
> 
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> PLEASE do read the posting guide
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On 04/27/2013 11:32 PM, triutami.iut at gmail.com wrote:
> Dear Sir,
> Yes, I want to generate the data by two Gaussian but mean from one of them
generatated from polar its coordinates. I am confused about the algorithm? I
know how to generate two Gaussian data with certain mean&covariance matrix
using mvnorm but what about mean from its polar coordinates?
> Thanks for your help.
>
Hi Iut,
If you mean transforming a normal (Gaussian) variate into polar 
coordinates, it is not too hard:

polar.norm<-180+rnorm(100,0,10)

You can alter the "mean" point by changing the constant value and the 
extent to which the tails wrap around the circles with the third 
argument to "rnorm". Be aware that large negative and positive values 
will "wrap around" to the polar values of the opposite sign depending 
upon the variance of the normal variate.

Jim