I need that duplicated indicate all row indices (occurences) that are duplicated. In your example, rows 2,3,4,5,8

Thanks.

Carol



On Monday, July 21, 2014 9:17 PM, William Dunlap <wdunlap@tibco.com> wrote:
 


Can you give an example of duplicated() not working on the rows of a matrix?

Here is an example where it does work:
> m <- cbind(c(a=1,b=2,c=3,d=2,e=3,f=4,g=1,h=1), c(11,13,11,13,11,13,13,11))
> class(m)
[1] "matrix"
> m
  [,1] [,2]
a    1   11
b    2   13
c    3   11
d    2   13
e    3   11
f    4   13
g    1   13
h    1   11
> duplicated(m)
[1] FALSE FALSE FALSE  TRUE  TRUE FALSE FALSE  TRUE
> m[duplicated(m), ]
  [,1] [,2]
d    2   13
e    3   11
h    1   11

Bill Dunlap
TIBCO Software
wdunlap tibco.com



On Mon, Jul 21, 2014 at 7:54 AM, carol white <wht_crl@yahoo.com> wrote:
> Hi,
> is it possible to find the duplicated rows of a matrix without a loop or i have to loop over the rows? duplicated doesn't seem to be helpful
>
> Thanks
>
> Carol
>
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