R help - May 2008 - How to identify overlapped items from two list and plot them?

Hi list,

I have a question on how to identify the overlapped items from two vectors:
>x<-c(0,1,2)
>y<-c(1,2,2,3)
and plot the number of the overlapped as well as non-overlapped in a
diagram?

Thanks much,
     Allen

	[[alternative HTML version deleted]]

Hello,

On May 31, 2008, at 4:10 PM, ss wrote:
> Hi list,
>
> I have a question on how to identify the overlapped items from two  
> vectors:
>
>> x<-c(0,1,2)
>> y<-c(1,2,2,3)
>
You can use the %in% operator to return a logical vector that  
indicates the overlap.

 > x<-c(0,1,2)
 > y<-c(1,2,2,3)
 > y %in% x
[1]  TRUE  TRUE  TRUE FALSE

> and plot the number of the overlapped as well as non-overlapped in a
> diagram?
>
I am not sure what you mean by plotting the number of overlaps.  Do  
you mean show the overlaps with a special symbol?  Or do you want to  
just show the number?

If it is the former, perhaps the following would do?

 > plot(x,rep(1,length(x)), xlim = c(0,5))
 > points(y, rep(1,length(y)), pch = "+")
 > iy = which(y %in% x)
 > points(y[iy], rep(1,length(iy)), pch = "+", col =
"red")

Cheers,
Ben
Ben



> Thanks much,
>      Allen
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting- 
> guide.html
> and provide commented, minimal, self-contained, reproducible code.
Ben Tupper
PemaquidRiver at tidewater.net

I GoodSearch for Ashwood Waldorf School.

Raise money for your favorite charity or school just by searching the  
Internet with GoodSearch - www.goodsearch.com - powered by Yahoo!

> I have a question on how to identify the overlapped items from two vectors:
> 
> >x<-c(0,1,2)
> >y<-c(1,2,2,3)
intersect(x,y)
> and plot the number of the overlapped as well as non-overlapped in a
> diagram?
Are you talking about a Venn diagram? There is a vennDiagram function in
the limma package and possibly in others.

You will find some hints here:

http://research.stowers-institute.org/efg/R/Math/VennDiagram.htm

cu
	Philipp

-- 
Dr. Philipp Pagel
Lehrstuhl f?r Genomorientierte Bioinformatik
Technische Universit?t M?nchen
Wissenschaftszentrum Weihenstephan
85350 Freising, Germany
 
 and
 
Institut f?r Bioinformatik und Systembiologie / MIPS
Helmholtz Zentrum M?nchen -
Deutsches Forschungszentrum f?r Gesundheit und Umwelt
Ingolst?dter Landstrasse 1
85764 Neuherberg, Germany
http://mips.gsf.de/staff/pagel