[R] Set Difference Problem

[Neha Aggarwal]

 Hello All,

I am facing a problem and am unable to find much help online as sets
package in R is relatively new.
My problem is as follows:

Set R is made of 2 sets x and y
x<-{"P1", "P2", "P3", "P4"}
y<-{}
R<-set(x,y)
#R={{}, {"P1", "P2", "P3", "P4"}}

i need to use R in a recursive loop where i need to take set difference of
R and it 's elements.
Example:
for (r in R){
    print(r)
    R<-set_symdiff(r,R)
    print(R)
}

the program is unable to recognise the null set in the set R. I tried
various funtions and methods:
> R-r
#Output : {{}, {"P1", "P2", "P3", "P4"}}
> set_symdiff(r,R)
Output: {{}, {"P1", "P2", "P3", "P4"}}
> set_symdiff(R,r)
Output: {{}, {"P1", "P2", "P3", "P4"}}

i also tried with set_complement() .But they do not subtract the null set
from the bigger set. It seems they dont recognise it.
What can I try, any pointers/ packages will be great help.
Please help
.
Thanks,
Neha

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