[R] help with creating new variables using a loop

[arun]

Hi,
 mood<- data.frame(Mood1=1:5,Mood2=6:10,Mood3=11:15)
lapply(seq_along(mood),function(i) i*mood[i])
A.K.




----- Original Message -----
From: christel lacaze <christellacaze at hotmail.co.uk>
To: r-help at r-project.org
Cc: 
Sent: Thursday, February 7, 2013 11:16 AM
Subject: [R] help with creating new variables using a loop


Hi there,

I've got a set of 10 numeric variables called Mood1 to Mood10 in a dataset called mood.  I'm trying to create a set of 10 new variables called m1 to m10 so that m1=Mood1*1, m2=Mood2*2, etc to m10=Mood10*10

Trawling through the internet, I eventually tried the following code:

for (i in 1:10){
  assign(x=paste0("mood$m",i),
         value=paste0("mood$Mood",i)*i,
         envir=.GlobalEnv)
}

unfortunately this doesn't work as it seems the paste0 function returns a list object that only contains the vector's name and not the vector itself.

Hope someone can help...

Christel
                          
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