How to evaluate sequence of strings like this

Tena koe

Try

apply(mydat, 1, paste, collapse='')

HTH ....

Peter Alspach

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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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.

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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??? [[alternative HTML version deleted]]

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