Gang Liang wrote:
Hi-
I used to use "<<-" to do assignment inside a class method, and just found that now it is broken in R 2.0. For example, the following code
----------------------------------------------------------------------- setClass( "myclass", representation(x="numeric") ) setGeneric("incrXByOne", function(obj) standardGeneric("incrXByOne")) setMethod( "incrXByOne", "myclass", function(obj) [EMAIL PROTECTED] <<- [EMAIL PROTECTED] + 1 )
Hi,
What (my guess) you want to define is:
setMethod( "incrXByOne", "myclass", function(obj) [EMAIL PROTECTED] <- [EMAIL PROTECTED] + 1;obj})
You do not need "<<-" to assign to a function argument? Its in my view even erroneous.
This S code gives an error too.
test <- function(x)
{
x$bla<<-x$bla + 1
}
test(1)
Error in test(1) : Object "x" not found/E
incrXByOne( new("myclass") ) -----------------------------------------------------------------------
will give an error message like:
Error in incrXByOne(new("myclass")) : Object "obj" not found ## R failed to trace the object back to the GlobalEnv...
It used to work under R1.7 - 1.9. I don't know whether this is a bug or a new feature...
Anyone can recommend a workaround?
Thanks, Gang
----------------------------- debian unstable, kernel 2.6.8
version
platform i386-pc-linux-gnu arch i386 os linux-gnu system i386, linux-gnu status major 2 minor 0.0 year 2004 month 10 day 04 language R
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