How to get a specific named element in a nested list

Could it be that you forgot to supply 'getEL()'? Or do I have to use some
package to make it available?

Oops - no. The problem was me stupidly renaming the function without
modifying the code.  Try this instead...

rmatch <- function(x, name) {
 pos <- match(name, names(x))
 if (!is.na(pos))
   return(x[[pos]])

 for (el in x) {
   if (class(el) == "list") {
     out <- rmatch(el, name)
     if (!is.null(out)) return(out)
   }
 }
}

Sorry about that.

Michael
-----Urspr?ngliche Nachricht-----
Von: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Im
Auftrag von Michael Bedward
Gesendet: Donnerstag, 11. November 2010 10:56
An: friedericksen.hope at gmail.com
Cc: r-help at stat.math.ethz.ch
Betreff: Re: [R] How to get a specific named element in a nested list

Hi Friedericksen,

This function will do it. No doubt there are more elegant ways :)

rmatch <- function(x, name) {
? pos <- match(name, names(x))
? if (!is.na(pos))
? ? return(x[[pos]])

? for (el in x) {
? ? if (class(el) == "list") {
? ? ? out <- getEl(el, name)
? ? ? if (!is.null(out)) return(out)
? ? }
? }
}

Michael

On 11 November 2010 19:05, Friedericksen Hope
<friedericksen.hope at gmail.com> wrote:
Hello,

I have a nested named list structure, like the following:

x <- list(
? ? ? ?list(
? ? ? ? ? list(df1,df2)
? ? ? ? ? list(df3,
? ? ? ? ? ? ? ?list(df4,df5))
? ? ? ?list(df6,df7)))

with df1...d7 as data frames. Every data frame is named.

Is there a way to get a specific named element in x?

so, for example,

x[[c("df5")]] gives me the data frame 5?

Thank you in advance!

Best,
Friedericksen

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How to get a specific named element in a nested list

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