On Jun 30, 2012, at 9:35 AM, mlell08 wrote:
Dear List,
I've created a two-dimensional array which shall contain a value and
its
error, respectively.
These two values are concatenated in al list and bear the names "sl"
and
"sl_err"
But I can't adress them using the $-notation.
a<- array(list(NULL),dim=c(2,2))
a[[1,1]]<- c(a=2,b=3)
a[[1,1]]$a
## Fehler in a[[1, 1]]$a : $ operator is invalid for atomic vectors
a[[1,1]]["a"] # This works however.
## a
## 2
I always thought these two methods of indexing are equal?
You thought wrong (on two accounts as it happens). The "$" methods
translate to "[[" with a quoted argument and there is no matrix/array
equivalent since vectors loose their names (if they had any to begin
with) when they are put into a matrix or array. The equivalent method
to x$a is x[["a"]], not x["a"].
Is there any
way to use the $-Style indexing?
Thank you,
Moritz
--
GnuPG Key: 0x7340821E
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
