?unique says
Value:
An object of the same type of 'x'. but if an element is equal to
one with a smaller index, it is removed.
However, I need to keep the one with the LARGEST index.
Can someone please show me the light?
I thought about reversing the row order twice, but I couldn't get it to work
right
(My data frame has 125000 rows and 7 columns,
and I'm 'uniqueing' on column #1 (chron) only, although the class of the column
may not matter.)
Say, e.g.,
> DF <- data.frame(t = c(1,2,3,1,4,5,1,2,3), x = c(0,1,2,3,4,5,6,7,8))
I would like the result to be (sorted as well)
t x
1 6
2 7
3 8
4 4
5 5
If I got the original rownames, that would be a bonus (for debugging.)
> R.version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 2
minor 3.1
year 2006
month 06
day 01
svn rev 38247
language R
version.string Version 2.3.1 (2006-06-01)
Thanks for any hints!
David
David L. Reiner
Rho Trading Securities, LLC
Chicago IL 60605
312-362-4963
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