In some cases, merge() has a problem in R-2.0.0 alpha (2004-09-14):
x <- structure(c("a", "b", "2", "0.2-26", "O", "O"), .Dim = c(2, 3),
.Dimnames = list(c("1", "2"), c("P", "V", "2")))
y <- structure(c("a", "b", "2", "0.2-25", "O", "O"), .Dim = c(2, 3),
.Dimnames = list(c("1", "2"), c("P", "V", "1")))
merge(x, y, all.y=TRUE)
Error in "[<-"(`*tmp*`, ri, value = NULL) :
incompatible types
Looks like the NA handling has changed anywhere.
Uwe Ligges
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