Gabor Grothendieck wrote:
Is this a bug? We define the [ operator for class test.
All it does is force drop to be FALSE and then calls
the NextMethod. If we specify drop= in the call then it works as expected (### 2 and ### 3) but if we do not
specify drop (### 1) then it acts as if drop=TRUE
even though we have set it to FALSE within [.test .
"[.test" <- function(x, i, j, drop = TRUE) {
+ drop <- FALSE
+ NextMethod("[") + }
x <- structure(matrix(1:12, 4, 3), class = "test")
x[1,] ### 1 - why does it ignore drop=FALSE in [.test ????
[1] 1 5 9
x[1,,drop = TRUE] ### 2 - ok
[,1] [,2] [,3] [1,] 1 5 9
x[1,,drop = FALSE] ### 3 - ok
[,1] [,2] [,3] [1,] 1 5 9
R.version.string # windows XP
[1] "R version 2.0.0, 2004-10-04"
Well, the *arguments* of the encolsing function are taken, but not the objects defined therein. What you can do is:
"[.test" <- function(x, i, j, drop = TRUE) {
NextMethod("[", drop = FALSE)
}Uwe Ligges
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