[R] Help with IF operator

[Peter Langfelder]

Several possibilities:

if (length(teams)!=length(unique(teams)) stop("Some teams are duplicated")

or

if (max(table(teams))>1) stop("Some teams are duplicated")

I'm sure there are others, too.



On Thu, Jan 6, 2011 at 12:21 PM, ADias <diasandre at gmail.com> wrote:
>
> Hi,
>
> I am with a problem on how to do a comparison of values. My script is as
> follows:
>
> repeat{
> cat("How many teams to use? (to end write 0) ")
> nro<-scan(n=1)
> if(nro==0)break
> cat("write the", nro, "teams names \n")
> teams<-readLines(n=nro)
> if (teams[1]==teams[2)next
> else print(teams)
> }
>
> On this example I only compare teams 1 name with teams 2 name, and if they
> are the same the scrip starts again. If I had 10 teams how could I make it
> compare the "nro" number of teams names in order to check if the same name
> has been written more then once? The idea is, if the same name is written
> more then once it should give an error and start the scrip again by asking
> the teams names again.
>
> Two more things: With the next function the script stats from top, I mean
> starts by asking the number of teams to use. Can I make it that it goes
> directly to asking teams names?
> And when it checks anc find out that a certain name has been written twice
> can it produce a message warning that this error happened before asking the
> teams names again?
>
> Many thanks
>
> Regards,
> A.Dias.
> --
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