Thank you.  It is working well.



On Sunday, 8 December 2013 11:13 PM, arun kirshna [via R] <ml-node+s789695n4681833h50@n4.nabble.com> wrote:
  
Hi, 
You could do without "eval(parse(.." 

mydat <- data.frame(Centercode=letters[1:5],FSUSN=letters[6:10],Round=letters[11:15],stringsAsFactors=FALSE) 
mydat1 <- paste(mydat$Centercode, mydat$FSUSN,mydat$Round,sep="") 
 mydat2 <- as.character(interaction(mydat,sep="")) 
 identical(mydat1,mydat2) 
#[1] TRUE 
#or 
mydat3 <- do.call(paste0,mydat) 
identical(mydat1,mydat2) 
#[1] TRUE 
A.K. 



On Sunday, December 8, 2013 8:58 AM, kingsly <[hidden email]> wrote: 
Hello Dear R community, 
 This is my problem.  I have a data set (dataframe) called "mydat". It consist of 3 numerical variable.  They are Centrecode, FSUSN and Round. I want to create unique ID by combining these 3 variables. 
Follwing commands gives me what I need. 

mydat1 <- paste(mydat$Centrecode, mydat$FSUSN,mydat$Round,sep="") 
newds <- data.frame(mydat1) 
  
 For a large data set, I don't want to write like this ...    "mydat$Centrecode, mydat$FSUSN,mydat$Round". So,  I tried to automate using following code. 
  
nvar <- paste("mydat","$",names(mydat)[1:3],sep="") 
mydat1 <- paste(eval(parse(text=nvar))) 
newds <- data.frame(mydat1_u) 
  
I am finding problem in the second line. Please help me.  
Thank you for your kind help. 



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