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753067
2010 Sep 30
1
Assignment to a slot in an S4 object in a list seems to violate copy rules?
Dear R-developers
I came across the following issue, which I find strange:
setClass("A", representation(a = "numeric"))
B <- list()
myA <- new("A", a = 1)
B$otherA <- myA
B$otherA at a <- 2
myA at a
Assigning a new value to slot 'a' in the _copy_ of myA stored
in B$otherA changes the original value of myA -- this was
surprising to me, and I