[R] R-Help

[john seers (IFR)]

I think this does what you require.

#Read your data in whatever way you wish:

d1<-data.frame(Date=c("2005/1/1","2005/2/1","2005/1/3","2005/1/4","2005/
1/7","2005/3/5"),
		x=c(119,123,-110,114,11,200),
		y=c(230,-125,300,-21,299,311))

d2<-data.frame(Date=c("2005/1/3","2005/1/4","2005/1/5","2005/1/6","2005/
3/5"),
		x=c(-220,116,888,-239,201),
		y=c(301,-23,3000,122,312))


d3<-data.frame(Date=c("2005/1/4","2005/1/5","2005/3/5","2005/4/23"),
		x=c(392,511,600,723),
		y=c(-81,6699,9311,1200))


#Make a list

listof<-list(d1,d2,d3)


#loop over any number of datasets merging as you go

for ( dataset in 1:length(listof)-1) {
	if (dataset == 1) {
	
res<-merge(listof[dataset],listof[dataset+1],all=T,by="Date")	
	} else {
		res<-merge(res,listof[dataset+1],all=T,by="Date")	
	}
}


# Hope that helps


JS







 
---

John Seers
Institute of Food Research
Norwich Research Park
Colney
Norwich
NR4 7UA
 

tel +44 (0)1603 251490 
fax +44 (0)1603 255167
e-mail john.seers at bbsrc.ac.uk                         
e-disclaimer at http://www.ifr.ac.uk/edisclaimer/ 
 
Web sites:

www.ifr.ac.uk   
www.foodandhealthnetwork.com


-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of stat stat
Sent: 20 April 2006 09:17
To: r-help at stat.math.ethz.ch
Subject: [R] R-Help


Dear r-users,
  
Suppose I have three datasets:
  Dataset-1:
  Date              x         y
  Jan-1,2005    120       230
Jan-2,2005    123       -125
Jan-3,2005    -110      300
Jan-4,2005    114       -21
Jan-7,2005    11        299
Mar-5,2005    200       311
   
  Dataset-2:
  Date              x          y
  Jan-2,2005    123       -125
Jan-3,2005    -110      300
Jan-4,2005    114       -21
Jan-5,2005    11        299
Jan-6,2005    -23       12
Mar-5,2005    200       311
   
  Dataset-3:
  Date              x          y
  Jan-3,2005    -110      300
Jan-4,2005    114       -21
Jan-5,2005    11        299
Mar-5,2005    200       311
Apl-23,2005   123       200
  Now I want to get the common dates along with x and y from this above
three datasets keeping the same order
in date-variable as it is.
  For ex. I want to get:
  Date            x          y                 x            y
x          y
               (from dataset-1)         (from dataset-2)          (from
dataset-3)
------------------------------------------------------------------------
------------------------
  Jan-3,2005    -110      300          -110         300
-110      300
Jan-4,2005     114      -21             114        -21               114
-21
Mar-5,2005    200       311           200         311              200
311
  Can anyone give me any R code to implement this for any number of
datasets ?
  Thanks and regards


thanks in advance
				
---------------------------------


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