[R] How to evaluate sequence of strings like this

[kingsly]

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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