Professor Ripley
thank you for this (and indeed thank you for solving my earlier
problem on octonions).
I still don't know how to force logic operations on brob objects to
give an error.
06, at 16:45, Prof Brian Ripley wrote:
> Accordng to the S4groupGeneric page, there is no such group.
>
> My guess as to why:
>
> Those operators are not S3 generic in R, and S4 dispatch is piggy-
> backed
> on S3 dispatch (not necessarily, but for convenience).
>
>
I have been trying to use the example on p119 of S Programming as
a template:
setClass("brob",
representation = representation
(x="numeric",positive="logical"),
prototype = list(x=numeric(),positive=logical())
)
.logicBrob <- function(e1,e2){
stop("No logic currently implemented for Brobdingnagian numbers")
}
setMethod("Logic",signature(e1="brob"), .logicBrob)
setMethod("Logic",signature(e2="brob"), .logicBrob)
but this does not work as desired (setMethod() gives an error). I want,
for example,
!new("brob", x=1:10,positive=rep(T,10))
to call .logicBrob() and report an error.
--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
tel 023-8059-7743
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