# Re: [R] Check values in colums matrix

From: Paul Smith <phhs80_at_gmail.com>
Date: Fri 25 Aug 2006 - 07:07:02 EST

On 8/24/06, Muhammad Subianto <msubianto@gmail.com> wrote:
> 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.

Just try

all(obj.tr[,2]==obj.tr[1,2])

and so on for the other columns. See ? all.

Paul

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