[R] help with creating new variables using a loop

[Uwe Ligges]

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
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