On Mar 6, 2012, at 13:02 , arunkumar1111 wrote:
> Hi
>
> I have a matrix
>
> a = 1 2 3
> 1 2 3
> 1 2 3
> 1 2 3
> 1 2 3
> 1 2 3
>
> b = 5 6 7
> 8 9 10
> I want output as
>
> c = 5 2 3
> 8 2 3
> 1 6 3
> 1 9 3
> 1 2 7
> 1 2 10
>
>
> Please any on help to avoid reduncy of my code
Here's one way:
> a <- matrix(rep(1:3,each=6),6)
> a
[,1] [,2] [,3]
[1,] 1 2 3
[2,] 1 2 3
[3,] 1 2 3
[4,] 1 2 3
[5,] 1 2 3
[6,] 1 2 3
> b <- matrix(5:10,2,byrow=T)
> ix <- cbind(1:6,rep(1:3,each=2))
> a[ix] <- b
> a
[,1] [,2] [,3]
[1,] 5 2 3
[2,] 8 2 3
[3,] 1 6 3
[4,] 1 9 3
[5,] 1 2 7
[6,] 1 2 10
--
Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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