Message-ID: <B393C191-9B9B-44DC-8459-1CC64527AC72@comcast.net>
Date: 2012-02-09T16:54:06Z
From: David Winsemius
Subject: ifelse
In-Reply-To: <A12872756FAB8042A67B0B286A9FB21503155C9C@aismsx.a-i-s.biz>
On Feb 9, 2012, at 11:37 AM, Arnaud Gaboury wrote:
> Hello,
>
> I need to print a screen message after a test.
>
>> list<-c("10","1","100","10")
>> ifelse(all(list %in% c(1,10,100)==TRUE),cat("YES\n"),cat("NO\n"))
> YES
> Error in ifelse(all(l %in% c(1, 10, 100) == TRUE), cat("YES\n"),
> cat("NO\n")) :
> replacement has length zero
>
>
> I have the correct answer, YES, but with an Error.
>
> Why?
cat() returns NULL. Why ar enou not just returning the strings
themselves or if you want to see the results as well as assign, then
use print() which does return its arguments.
>
> TY for any help
>
>
> Arnaud Gaboury
>
> A2CT2 Ltd.
>
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> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT