Unless I'm missing something, I don't see any method
in pkg:sets for intersection other than gset_intersection.
So you're using the base R function `&` whose help page
tells you that its arguments should be vectors. Yours
aren't.
-Peter Ehlers
On 2010-03-31 8:50, Czerminski, Ryszard wrote:
When using generalized sets from "sets" library
A& EMPTY does not work, but gset_intersection(A,EMPTY) works: example
code below
Is it a bug?
Best regards,
Ryszard
library(sets)
support<- universe<- c('a','b','c','d')
A<- gset(support=support, memberships=c(0.2, 0.2, 0.9, 0),
universe=universe)
class(A)
A
E<- A - A # create empty set
I<- gset_intersection(A, E) #<<< this WORKS
class(I); I
I<- A& E #<<< this DOES NOT WORK
# ---
support<- universe<- c('a','b','c','d')
A<- gset(support=support, memberships=c(0.2, 0.2, 0.9, 0),
universe=universe)
class(A)
[1] "gset" "cset"
A
{"a" [0.2], "b" [0.2], "c" [0.9]}
E<- A - A
I<- gset_intersection(A, E) #<<< this WORKS
class(I); I
[1] "set" "gset" "cset"
{}
I<- A& E #<<< this DOES NOT WORK
Error in A& E :
operations are possible only for numeric or logical types
In addition: Warning message:
Incompatible methods ("Ops.gset", "Ops.set") for "&"
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Peter Ehlers
University of Calgary
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