[R] help with creating new variables using a loop

arun smartpink111 at yahoo.com
Sun Feb 10 02:37:41 CET 2013


Just to add:
If the columns are  not in the order (Mood1:Mood10) in the dataset. 
mood<- data.frame(Mood2=6:10,Mood1=1:5,Mood10=11:15,Mood3=16:20) 
do.call(cbind,lapply(names(mood),function(i) mood[i]*as.numeric(gsub("\\D+","",i))))

#  Mood2 Mood1 Mood10 Mood3
#1    12     1    110    48
#2    14     2    120    51
#3    16     3    130    54
#4    18     4    140    57
#5    20     5    150    60

----- Original Message -----
From: christel lacaze <christellacaze at hotmail.co.uk>
To: r-help at r-project.org
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){

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...

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