Message-ID: <1386521991.56294.YahooMailNeo@web142603.mail.bf1.yahoo.com>
Date: 2013-12-08T16:59:51Z
From: arun
Subject: How to evaluate sequence of strings like this
In-Reply-To: <1386501696.10821.YahooMailNeo@web190502.mail.sg3.yahoo.com>
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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