On 11-03-19 10:21 PM, Kenn Konstabel wrote:
On Sun, Mar 20, 2011 at 4:13 AM, Kenn Konstabel<lebats...@gmail.com> wrote:
you can omit the list and do the following:
/.../
(but you don't really need "this" in this case as you can use "balance"
instead of "this$balance")
P.S. using "this" would make some difference in one case:
instead of
total<<- total + amount # need<<- here
you can have
this$total<- this$total + amount # can use<-
This is a very un-R-like way of programming, so I wouldn't recommend it.
The reason it works is that environment objects are special: they are
handled by reference, whereas with most other kinds of objects
assignment creates a new copy, and assignment with "<-" makes the
assignment locally.
So if at some point you switched this to be a list() object instead of
an environment, the line
this$total <- this$total + amount
would have quite a different meaning.
Duncan Murdoch
______________________________________________
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.
