On 6/5/2008 6:38 AM, Karin Lagesen wrote:
I know this is fairly basic, but I must have somehow missed it in the
manuals.
I have two vectors, often of unequal length. I would like to compare
them for identity. Order of elements do not matter, but they should
contain the same.
I.e: I want this kind of comparison:
if (1==1) show("yes") else show("blah")
[1] "yes"
if (1==2) show("yes") else show("blah")
[1] "blah"
Only replace the numbers with for instance the vectors
a = c("a")
b = c("b","c")
c = c("c","b")
Now, I realize I only get a warning when comparing things, but this to
me means that I am not doing it correctly:
if (a==a) show("yes") else show("blah")
[1] "yes"
if (a==b) show("yes") else show("blah")
[1] "blah"
Warning message:
In if (a == b) show("yes") else show("blah") :
the condition has length > 1 and only the first element will be used
if (b == c) show("yes") else show("blah")
[1] "blah"
Warning message:
In if (b == c) show("yes") else show("blah") :
the condition has length > 1 and only the first element will be used
I have also tried the %in% comparator, but that one throws warnings too:
if (b %in% c) show("yes") else show("blah")
[1] "yes"
Warning message:
In if (b %in% c) show("yes") else show("blah") :
the condition has length > 1 and only the first element will be used
if (c %in% c) show("yes") else show("blah")
[1] "yes"
Warning message:
In if (c %in% c) show("yes") else show("blah") :
the condition has length > 1 and only the first element will be used
So, how is this really supposed to be done?
a <- c("a")
b <- c("b","c")
c <- c("c","b")
if (setequal(a, b)) show("yes") else show("blah")
[1] "blah"
if (setequal(a, c)) show("yes") else show("blah")
[1] "blah"
if (setequal(b, c)) show("yes") else show("blah")
[1] "yes"
?setequal
Thanks!
Karin
______________________________________________
R-help@r-project.org mailing list
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.
--
Chuck Cleland, Ph.D.
NDRI, Inc. (www.ndri.org)
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 512-0171 (M, W, F)
fax: (917) 438-0894
______________________________________________
R-help@r-project.org mailing list
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.
