From: Marc Schwartz (via MN) <mschwartz_at_mn.rr.com>

Date: Sat 15 Jul 2006 - 01:16:22 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Jul 15 01:20:20 2006

Date: Sat 15 Jul 2006 - 01:16:22 EST

On Fri, 2006-07-14 at 16:57 +0200, Georg Otto wrote:

*> Hi,
**>
*

> I want to generate object names out of variables in a sort of variable

*> substitution.
**>
**> first i generate some vectors and an empty list:
**>
**> > vector.a<-c("a","b")
**> > vector.b<-c("c","d")
**> > vector.c<-c("e","f")
**> > vectors<-c("vector.a", "vector.b", "vector.c")
**> > vectors
**> [1] "vector.a" "vector.b" "vector.c"
**>
**> > vectorlist<-list()
**>
**> What I would then like to do is to generate elements of the list by
**> using variables, somehow like this (does not work):
**>
**> >for (i in vectors) {
**> + list$i<-i
**> + }
**>
**> To end up with a list like this:
**>
**> > list
**> $vector.a
**> [1] "a" "b"
**> $vector.b
**> [1] "c" "d"
**> $vector.c
**> [1] "e" "f"
**>
**>
**> Any hint will be appreciated.
**>
**> Cheers,
**>
**> Georg
*

Presuming that your vectors fit a naming pattern of "vector.x":

# Use grep() to get the vector names from ls()

> vectors <- grep("vector[\.]", ls(), value = TRUE)

> vectors

[1] "vector.a" "vector.b" "vector.c"

# Use sapply to create the list

> sapply(vectors, get, simplify = FALSE)

$vector.a

[1] "a" "b"

$vector.b

[1] "c" "d"

$vector.c

[1] "e" "f"

**HTH,
**
Marc Schwartz

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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 Received on Sat Jul 15 01:20:20 2006

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