[R] parse on left hand side of R assignment

Spencer Graves spencer.graves at pdf.com
Sat May 31 19:25:40 CEST 2003

Have you considered the following:

 > myList <- list()
 > iteration <- 1
 > varName <- paste("run",iteration,sep="")
 > myList[[varName]] <- "aColumn"
 > myList
[1] "aColumn"

hth.  spencer graves

Paul E. Johnson wrote:
> I keep finding myself in a situation where I want to calculate a 
> variable name and then use it on the left hand side of an assignment. 
> For example
> iteration <- 1
> varName <- paste("run",iteration,sep="")
> myList$parse(text=varName) <- aColumn
> I want to take some existing variable  "aColumn" and use the name 
> "varName" name for it and put it into a list "myList".  That use fails 
> with this error:
> Error: couldn't find function "(<-"
> I've tried many variations on the theme.
> If I could do this with a data frame, I would be just as happy. Right 
> now I'm using a list rather than a data frame because not all columns 
> are of the same length. But I can work around that.

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