[R] extract positive pairs

[Bill.Venables at csiro.au]

I'm assuming the column names really are X1 and X2, literally.  If so, why not

y1y2_dash <- subset(y1y2, X1 > 0 & X2 > 0)

?

Note: Here you need '&', not '&&'.

Bill Venables
http://www.cmis.csiro.au/bill.venables/ 


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Roslina Zakaria
Sent: Wednesday, 28 January 2009 11:06 AM
To: r-help at r-project.org
Subject: [R] extract positive pairs

Hi,

I have a data below and would like to search for positive pairs only and form a new data set.
           X1             X2
31.0 9.0 
11.0 1.0 
1.0 0.0 
0.0 0.0 
8.0 0.0 
0.0 0.0 
2.0 2.0 
18.0 3.0 
0.0 0.0 
0.0 0.0 
0.0 0.0 
10.0 0.0 
6.0 0.0 
...

The new data will be 

X1'   X2'
31.0 9.0 
11.0 1.0 
2.0 2.0 
18.0 3.0 

I tried to write the function as:

y1y2 <-  read.csv("genX1X2.csv", header=FALSE)
(y1y2[,1] > 0 )  &&  (y1y2[,2]>0)
cbind(y1y2[,1],y1y2[,2])
 
Thank you for your help.




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