R help - Jun 2007 - Datapoints underneath datapoints Problem

Hi there.

I have the following graph:

http://www.nabble.com/file/p10928148/map.jpg 

However, some datapoints occur at the same place as other datapoints and are
so layered on top of each other. I would like to know if there is any
possible way in which I could view those datapoints that are layered on top
of each other ...maybe by rotating using latitude to show the datapoints
underneath (but then is that possible?)??? - just an idea.

Many thanks.

Sam.
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mister_bluesman wrote:
> Hi there.
> 
> I have the following graph:
> 
> http://www.nabble.com/file/p10928148/map.jpg 
> 
> However, some datapoints occur at the same place as other datapoints and
are
> so layered on top of each other. I would like to know if there is any
> possible way in which I could view those datapoints that are layered on top
> of each other ...maybe by rotating using latitude to show the datapoints
> underneath (but then is that possible?)??? - just an idea.
> 
> Many thanks.
> 
> Sam.

You can use common techniques such as jitter() or transparency (alpha 
shading), depending on the amount of datapoints that are layered on top
of each other.

Of course, you can also rotate the data, but then you will have to 
decide which way makes sense - and you have to add some randomness as 
well, or two points will be rotated to the same new coordinates unless 
there is another variable that will cause a difference.


Uwe Ligges

Uwe Ligges wrote:
> 
> Of course, you can also rotate the data, but then you will have to 
> decide which way makes sense - and you have to add some randomness as 
> well, or two points will be rotated to the same new coordinates unless 
> there is another variable that will cause a difference.
> 
Do you know of any functions/tutorials that will show me how to do this? I
dont even know how to rotate the plot!

Many thanks!
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> I would like to know if there is any
> possible way in which I could view those datapoints that are layered on top
> of each other
You could use jitter() to add a little noise to the data. Of course that
will slightly change the position of each point.

If that is not an option you could possibly detect points with almost
identical coordintes yourself and then change the color of the
respective plotting symbol.

cu
	Philipp

-- 
Dr. Philipp Pagel                            Tel.  +49-8161-71 2131
Dept. of Genome Oriented Bioinformatics      Fax.  +49-8161-71 2186
Technical University of Munich
Science Center Weihenstephan
85350 Freising, Germany

 and

Institute for Bioinformatics / MIPS          Tel.  +49-89-3187 3675
GSF - National Research Center               Fax.  +49-89-3187 3585
      for Environment and Health
Ingolst?dter Landstrasse 1
85764 Neuherberg, Germany
http://mips.gsf.de/staff/pagel

Check out ?sunflowerplot


On 6/2/07, mister_bluesman <mister_bluesman at hotmail.com>
wrote:
>
> Hi there.
>
> I have the following graph:
>
> http://www.nabble.com/file/p10928148/map.jpg
>
> However, some datapoints occur at the same place as other datapoints and
are
> so layered on top of each other. I would like to know if there is any
> possible way in which I could view those datapoints that are layered on top
> of each other ...maybe by rotating using latitude to show the datapoints
> underneath (but then is that possible?)??? - just an idea.
>
> Many thanks.
>
> Sam.
> --
> View this message in context:
http://www.nabble.com/Datapoints-underneath-datapoints-Problem-tf3857288.html#a10928148
> Sent from the R help mailing list archive at Nabble.com.
>
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