Hi,
I have an S4 class that inherits from "array" but does not add generic
implementations of the "[" method.
A simplified example is:
setClass("fooarray", contains="array")
If I create a "fooarray" object and subset it with a one-dimensional
index vector, the return value is of class "fooarray". Other variants
(see below), however, return primitive values consistent with
"ordinary" array subsetting.
x <- new("fooarray", array(0,c(10,10,10)))
class(x[1,1,1]) # prints "numeric"
class(x[1,,]) # prints "matrix"
class(x[1]) # prints "fooarray"
class(x[1:10]) # prints "fooarray"
This behavior seems to have been introduced in R2.8.1 as I have not
encountered it before. I tested it on R.2.7.0 and confirmed that
class(x[1]) returned "numeric".
In my case, the desired behavior is for array subsetting in all cases
to return primitive data structures, so if there is a way to override
the new behavior I would opt for that.
Regards,
Brad Buchsbaum
R version 2.8.1 (2008-12-22)
i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--
Bradley R. Buchsbaum
Rotman Research Institute
3560 Bathurst St.
Toronto, ON Canada M6A 2E1
email: bbuchsb...@rotman-baycrest.on.ca
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
