Hi
In V&R the "polynomial" class is explicitly specified to have no
logical operators:
setMethod("Logic", signature(e1="polynomial"), function(e1,e2){stop
("...")})
I too have a class of objects for which I want to
specify that Logic operators do not work, but executing
setClass("brob",
representation = representation
(x="numeric",positive="logical"),
prototype = list(x=numeric(),positive=logical())
)
setMethod("Logic",signature(e1="brob"), function(e1,e2)
{
stop("No logic currently implemented for brob objects")
}
)
gives me
Error in setMethod("Logic", signature(e1 = "brob"), function(e1, e2) { :
no existing definition for function 'Logic'
?Math seems to imply that there is no "Logic" group.
So, what is the correct way to specify that logical operations are
not allowed for "brob" objects?
--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
tel 023-8059-7743
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