[BioC] R question on symbolic variables

[axel.klenk at actelion.com]

Dear Chris,

the latter. I think you want:

a <- list(hello = c(1,2,3), goodbye = c(1,2,3))
b <- "hello"
a[b]
a[[b]]

Note the difference between extracting a sublist
using '[' and a list element using '[[' and see:

?"["

Cheers,

 - axel



Axel Klenk
Research Informatician
Actelion Pharmaceuticals Ltd / Gewerbestrasse 16 / CH-4123 Allschwil /
Switzerland



                                                                           
             Chris Fenton                                                  
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                                       [BioC] R question on symbolic       
             01/14/2010 09:54          variables                           
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Is this a limitation in the R language or am I missing something
fundamental (like an operator)

> a <- list("hello"<-c(1,2,3), "goodbye"<-c(1,2,3))
> a$hello
[1] 1 2 3

> b <- "hello"
> a$b
NULL


So how could we do the following for example.

> info <- names(a)
> for (i in 1:length(info)){cat(a$info[i]);}


Chris

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