Re: [R] help with creating new variables using a loop
On 07.02.2013 17:16, christel lacaze wrote:
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)
}
Indexing works via
mood[[paste0(Mood, i)]]
However, assignment to separate objects is typically a bad idea, just
aollect them in another data.frame or list.
Uwe Ligges
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
[[alternative HTML version deleted]]
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Re: [R] help with creating new variables using a loop
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 christellac...@hotmail.co.uk
To: r-help@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
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
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https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] help with creating new variables using a loop
Hi,
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
A.K.
- Original Message -
From: christel lacaze christellac...@hotmail.co.uk
To: r-help@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
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] help with creating new variables using a loop
On Thu, Feb 7, 2013 at 4:16 PM, christel lacaze
christellac...@hotmail.co.uk wrote:
Hi there,
I've got a set of 10 numeric variables called Mood1 to Mood10 in a dataset
called mood.
That's where you went wrong in the first place. Don't use variable
names for indexing purposes.
You should have created one variable, a list, where each element is
one of your Mood1, Mood2 etc variables. You can do that:
Mood = list(Mood1,Mood2,Mood3 [etc])
but its easier to create the right thing in the first place.
Then looping is simple, and intuitive. Just get Mood2[[i]] where i is
your loop variable. No mucking with paste and get and all that stuff
we should have left behind years ago...
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
What you mean is you want to create a new variable, a list, with 10 elements.
m = list()
for(i in 1:10){m[[i]]=i*Mood[[i]]}
or even:
m = lapply(1:10,function(i){i*Mood[[i]]})
this kind of thing is so much easier once you've put everything in an
indexable list, I'm not going to tell you how to paste names together.
It can be done, but... yuck.
Barry
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