On 18/03/2018 11:00 AM, Neha Aggarwal wrote:
Hello,
Problem I am facing is as follows:
Set A is made of 2 sets x and y
x<-{"P1", "P2", "P3", "P4"}
y<-{}
Those aren't R code. I think you meant
x <- set("P1", "P2", "P3", "P4")
y <- set()
A<-set(x,y)
#A={{}, {"P1", "P2", "P3", "P4"}}
i need to use A in a recursive loop where i need to take set difference of
A and it 's elements.
This doesn't really make sense. A is a set of sets. Its elements are
sets of character strings. There is no intersection between A and
either of its elements, so the symmetric difference is just the union.
What do you really want?
Example:
for (i in A){
print(i)
A<-set_symdiff(i,A) ###Imp line i need help on
print(A)
}
That changes A each time through the loop. Did you really want that?
the program is unable to recognise the empty set in the set A. I tried
various methods in Imp line above:
A-i
#Output : {{}, {"P1", "P2", "P3", "P4"}}
set_symdiff(i,A)
Output: {{}, {"P1", "P2", "P3", "P4"}}
set_symdiff(A,i)
Output: {{}, {"P1", "P2", "P3", "P4"}}
i also tried with set_complement() .But it does not subtract the empty
subset from the bigger set. It seems it doesn't recognise it.
What else can I try ? any pointers/ packages will be great help.
I'm not sure what you are after, but you might want something like
set_symdiff(set(i), A)
or
A - set(i)
Duncan Murdoch
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
