[R] How to evaluate sequence of strings like this

[arun]

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 <ecokingsly at yahoo.co.in> 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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