[R] library sets: A & EMPTY does not work; gset_intersection(A,EMPTY) works
Czerminski, Ryszard
Ryszard.Czerminski at astrazeneca.com
Wed Apr 7 14:54:06 CEST 2010
Thank you for looking into it!
There is still something I do not understand (despite different numerics on different machines, etc.)
On my system plain "p == p" (where p's are from runif())
gives all TRUE values, but with q (gset) which memberships values are set to p
"q == q" generates FALSE
Apparently memberships values are identical, tags of set members are identical (letters),
but "q == q" still generates FALSE...
Best regards,
Ryszard
p <- runif(length(letters))
q <- gset(letters, p)
summary(p == p) # gives all TRUE values, but
q == q # gives FALSE
summary(p == gset_memberships(q)) # and this gives all TRUE values
> p <- runif(length(letters))
> q <- gset(letters, p)
> summary(p == p) # gives all TRUE values, but
Mode TRUE
logical 26
> q == q # gives FALSE
[1] FALSE
> summary(p == gset_memberships(q)) # and this gives all TRUE values
Mode TRUE
logical 26
>
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-----Original Message-----
From: David Meyer [mailto:david.meyer at wu.ac.at]
Sent: Wednesday, April 07, 2010 8:25 AM
To: Czerminski, Ryszard
Cc: Peter Ehlers; R-help at R-project.org; David Meyer
Subject: Re: [R] library sets: A & EMPTY does not work; gset_intersection(A,EMPTY) works
>> This is rather by chance due to numeric instabilities, I think:
> It looks like something else is going on in addition to potential problem
> with numerical instabilities:
>
> p <- runif(length(letters))
> q <- gset(letters, p)
> all.equal(p,p)
> all.equal(q,q)
> q == q
>
>> p <- runif(length(letters))
>> q <- gset(letters, p)
>> all.equal(p,p)
> [1] TRUE
>> all.equal(q,q)
> [1] "target and current have different memberships"
>> q == q
> [1] FALSE
On my system:
> p <- runif(length(letters))
> q <- gset(letters, p)
> all.equal(p,p)
[1] TRUE
> all.equal(q,q)
[1] TRUE
> q == q
[1] TRUE
This is the same problem, since the all.equal-method for gsets does not
use all.equal internally (which *is* a bug, of course!). Will be fixed
ASAP ...
Thanks
David
>
>
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>
> -----Original Message-----
> From: David Meyer [mailto:david.meyer at wu.ac.at]
> Sent: Tuesday, April 06, 2010 6:03 PM
> To: Czerminski, Ryszard
> Cc: Peter Ehlers; R-help at R-project.org; David Meyer
> Subject: Re: [R] library sets: A & EMPTY does not work; gset_intersection(A,EMPTY) works
>
> This is rather by chance due to numeric instabilities, I think:
>
> > uv <- c('a', 'b', 'c'); s <- gset(uv, runif(length(uv)))
> > s
> {"a" [0.7533966], "b" [0.968067], "c" [0.2494876]}
> > s == s
> [1] TRUE
> > gset_is_equal(s,s)
> [1] TRUE
>
> But using all.equal instead of `==` for the memberships might by a good
> idea, I will have a look at it.
>
> Thanks
> David
>
> Czerminski, Ryszard wrote:
>> Hi Peter,
>>
>> This looks like another one: "gset_is_equal(X,X)" and "X == X" evaluate to FALSE ?
>>
>>> uv <- c('a', 'b', 'c'); s <- gset(uv, runif(length(uv)))
>>> s
>> {"a" [0.0811552], "b" [0.3552998], "c" [0.996772]}
>>> gset_is_equal(s, s)
>> [1] FALSE
>>> s == s
>> [1] FALSE
>>> class(s)
>> [1] "gset" "cset"
>>
>> Best regards,
>> Ryszard
>>
>>
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>>
>> -----Original Message-----
>> From: Peter Ehlers [mailto:ehlers at ucalgary.ca]
>> Sent: Wednesday, March 31, 2010 2:03 PM
>> To: Czerminski, Ryszard
>> Cc: R-help at r-project.org; David Meyer
>> Subject: Re: [R] library sets: A & EMPTY does not work; gset_intersection(A,EMPTY) works
>>
>> Ryszard,
>>
>> You've made me take a closer look and now I do think that
>> you've found a bug.
>>
>> After a quick look at the package vignette, I see that the
>> authors have indeed overloaded "&" and so it should work for
>> your example. The problem seems to be the order of the class
>> attribute which is used to call the relevant 'Ops' function:
>>
>> class(A)
>> #[1] "gset" "cset"
>>
>> class(B)
>> #[1] "gset" "cset"
>>
>> class(E <- A - A)
>> #[1] "set" "gset" "cset"
>>
>> If you re-order the class vector, function Ops.gset will be called
>> to handle A and E:
>>
>> class(E) <- class(E)[c(2,3,1)]
>> A & E
>> #{}
>>
>> I've cc'd David Meyer.
>>
>> -Peter Ehlers
>>
>> On 2010-03-31 10:11, Czerminski, Ryszard wrote:
>>> It seems that "A& B" works the same way as "gset_intersection(A,B)"
>>> as long as A and B are not empty...
>>> see below:
>>>
>>> fuzzy_logic("Yager", p=2)
>>> support<- universe<- c('a','b','c','d')
>>> A<- gset(support=support, memberships=c(0.2, 0.2, 0.9, 0),
>>> universe=universe)
>>> B<- gset(support=support, memberships=c(0.211, 0.222, 0.999, 0),
>>> universe=universe)
>>> A
>>> B
>>> A& B
>>> gset_intersection(A,B)
>>> E<- A - A
>>> A& E
>>> gset_intersection(A,E)
>>>
>>>> fuzzy_logic("Yager", p=2)
>>>> support<- universe<- c('a','b','c','d')
>>>> A<- gset(support=support, memberships=c(0.2, 0.2, 0.9, 0),
>>> universe=universe)
>>>> B<- gset(support=support, memberships=c(0.211, 0.222, 0.999, 0),
>>> universe=universe)
>>>> A
>>> {"a" [0.2], "b" [0.2], "c" [0.9]}
>>>> B
>>> {"a" [0.211], "b" [0.222], "c" [0.999]}
>>>> A& B
>>> {"c" [0.899995]}
>>>> gset_intersection(A,B)
>>> {"c" [0.899995]}
>>>> E<- A - A
>>>> A& E
>>> Error in A& E :
>>> operations are possible only for numeric or logical types
>>> In addition: Warning message:
>>> Incompatible methods ("Ops.gset", "Ops.set") for "&"
>>>> gset_intersection(A,E)
>>> {}
>>>
>>>
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>>>
>>> -----Original Message-----
>>> From: Peter Ehlers [mailto:ehlers at ucalgary.ca]
>>> Sent: Wednesday, March 31, 2010 11:43 AM
>>> To: Czerminski, Ryszard
>>> Cc: R-help at r-project.org
>>> Subject: Re: [R] library sets: A& EMPTY does not work;
>>> gset_intersection(A,EMPTY) works
>>>
>>> On 2010-03-31 9:30, Peter Ehlers wrote:
>>>> Unless I'm missing something, I don't see any method
>>>> in pkg:sets for intersection other than gset_intersection.
>>> Whoops, a bit quick on the draw.
>>> There are of course also set_intersection and cset_intersection,
>>> but not AFAICS any method for `&`.
>>>
>>> -Peter Ehlers
>>>
>>>> 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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>
--
Priv.-Doz. Dr. David Meyer
Department of Information Systems and Operations
WU
Wirtschaftsuniversität Wien
Vienna University of Economics and Business
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