R help - Jan 1999 - avoiding (another) error

Dear all,

Many thanks to all who always so quickly respond with helpful hints!

Currently I am working with R 0.63.1 on SuSE 5.2 which I installed this
morning within about half an hour: my deepest compliments to the
developpers! (I had still 0.62.2 before.)

This time I am trying the following:
> xy <- list (a= c (1, 2, NA), b= c (2, 3))
> list.name <- "xy"
> get (list.name)$a [is.na (get (list.name)$a)] <- 0
Error: couldn't find function "get<-"
> xy
$a
[1] 1 2 0

$b
[1] 2 3

So obvisouly R does what I would like it to do. How can I get it to do it
without the error? The problem is that I need to do this within a
function.

Thanks for ideas and hints! Regards,
--			~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lorenz Gygax		 LGygax at amath.unizh.ch;       room: 36-L-40
			 Department of Applied Mathematics
			 University of Zuerich-Irchel
			 Winterthurerstr. 190; CH-8057 Zurich
			 voice: 41-1-635-58-52  fax: 41-1-635-57-05
			~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._

>>>>> "Lorenz" == Lorenz Gygax <lgygax at
access.unizh.ch> writes:
    Lorenz> Dear all, Many thanks to all who always so quickly respond with
    Lorenz> helpful hints!

    Lorenz> Currently I am working with R 0.63.1 on SuSE 5.2 which I
    Lorenz> installed this morning within about half an hour: my deepest
    Lorenz> compliments to the developpers! (I had still 0.62.2 before.)

    Lorenz> This time I am trying the following:

	> xy <- list (a= c (1, 2, NA), b= c (2, 3))
	> list.name <- "xy"
	> get (list.name)$a [is.na (get (list.name)$a)] <- 0
	Error: couldn't find function "get<-"
	> xy
	$a
	[1] 1 2 0

	$b
	[1] 2 3

    Lorenz> So obvisouly R *does* what I would like it to do.

But it shouldn't and this is the real bug here!

    Lorenz> How can I get
    Lorenz> it to do it without the error? The problem is that I need to do
    Lorenz> this within a function.

One way (maybe the most elegant?) :

	xy <- list (a= c (1, 2, NA), b= c (2, 3)); list.name <- "xy"

	A <- .Alias(get(list.name)) 
	A$a[is.na(A$a)] <- 0

	xy $ a	# -> 1 2 0
 
	##-- would this be a convincing example for  .Alias() ??

--
Martin
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._