This looks unintentional:
> d <- as.Date("2004-09-07")
> dd <- as.Date("2004-10-04")
> data.frame(d,dd,dd-d)
Error in as.data.frame.default(x[[i]], optional = TRUE) :
can't coerce difftime into a data.frame
> F <- data.frame(d,dd)
> F$foo <- dd-d
> cbind(F,dd-d)
Error in as.data.frame.default(x[[i]], optional = TRUE) :
can't coerce difftime into a data.frame
Basically, the issue is that as.data.frame on a classed object expects
to find a method and there isn't any for difftime...
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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