Hi R-folks,
R is a great data analysis system and yes, there is some object
orientation (OO). My problem coming from other OO-languages like JAVA
is, that I have problems constructing "objects", which contain data
(object properties) and code (methods). Is there any mechanism like the
"self" or "my" in other languages.
In the R introduction I found an example, like:
test <- function() {
a<-1,
b<-2,
list (
geta = function () a,
seta = function (newa) a<<-newa,
)
}
Now I can create an instance of test:> aTest <- test()
and call the functions > aTest$geta()
and e.g.> aTest$seta(5)
or> aTest$product()
with the expected results. Now, as the "object" becomes more complex I
want to call local functions, e.g. in the extended object:
test2 <- function() {
a<-1,
b<-2,
list (
geta = function () a,
seta = function (newa) a<<-newa,
product = function() a*b,
localcall = function() product() # a function which *should
call* a function of the "object"
)
}
where the function localcall() should call the local function product().
Written as above, this will not work, as the function product() exists
in another environment. Is there a straightforward solution for this
(common OO) problem?
Thanks in advance!
Thomas Petzoldt
--
Thomas Petzoldt
Institute of Hydrobiology
Dresden University of Technology
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