many thanks for replying
the code 
A is list of sets where each list element is a set
 i<-1
A[i]<-3
#inside the loop
     i<-i+1;
     # for example  new element in the list will be {7,9}, each added 
separately inside the loop 
       A[i]  <- union( A[[i]]   ,new element)

many thanks for replying

Regards
R.
> Subject: Re: [R] union empty set with an element
> From: b...@xs4all.nl
> Date: Mon, 19 Jan 2015 16:00:28 +0100
> CC: r-help@r-project.org
> To: ragi...@hotmail.com
> 
> 
> > On 19-01-2015, at 15:51, Ragia Ibrahim <ragi...@hotmail.com> wrote:
> > 
> > Hello,
> > I started the program with an empty set then I add and element when needed.
> > the problem how can I add the first element to the empty set
> > union(set_name   ,element)
> > gives "subscript out of bounds �
> > 
> 
> Which program did you start?
> Show us the code you used to get the error message.
> 
> Berend
> 
> 
> > thanks in advance
> > R.
> >                                       
> >     [[alternative HTML version deleted]]
> > 
> 
> Post in plain text, please.
> 
> > ______________________________________________
> > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> 
                                          
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