[R] Check values in colums matrix

From: Muhammad Subianto <msubianto_at_gmail.com>
Date: Fri 25 Aug 2006 - 02:59:22 EST


Dear all,
I apologize if my question is quite simple. I have a dataset (20 columns & 1000 rows) which some of columns have the same value and the others have different values.
Here are some piece of my dataset:

obj <- cbind(c(1,1,1,4,0,0,1,4,-1),
             c(0,1,1,4,1,0,1,4,-1),
             c(1,1,1,4,2,0,1,4,-1),
             c(1,1,1,4,3,0,1,4,-1),
             c(1,1,1,4,6,0,1,5,-1),
             c(1,1,1,4,6,0,1,6,-1),
             c(1,1,1,4,6,0,1,7,-1),
             c(1,1,1,4,6,0,1,8,-1))

obj.tr <- t(obj)
obj.tr
> obj.tr

     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
[1,] 1 1 1 4 0 0 1 4 -1
[2,] 0 1 1 4 1 0 1 4 -1
[3,] 1 1 1 4 2 0 1 4 -1
[4,] 1 1 1 4 3 0 1 4 -1
[5,] 1 1 1 4 6 0 1 5 -1
[6,] 1 1 1 4 6 0 1 6 -1
[7,] 1 1 1 4 6 0 1 7 -1
[8,] 1 1 1 4 6 0 1 8 -1
>

How can I do to check columns 2,3,4,6,7 and 9 have the same value, and columns 1,5 and 8 have different values.

Best, Muhammad Subianto



R-help@stat.math.ethz.ch 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. Received on Fri Aug 25 03:24:40 2006

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Fri 25 Aug 2006 - 20:25:12 EST.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.