On 11 Oct 2007, at 12:55, Martin Ivanov wrote:
> Dear R users,
> I need to to the the following. Let a= 1 2 3
> 4 5 6
> and b= -1 -2 -3 be (2x3) matrices.
> -4 -5 -6
> I need to combine the two matrices into a new (2x6) matrix like this:
>
> ab = ( 1 -1 2 -2 3 -3 )
> 4 -4 5 -5 6 -6
>
> How can this be done in R?
>
>
> a
[,1] [,2] [,3]
[1,] 1 2 3
[2,] 4 5 6
> b
[,1] [,2] [,3]
[1,] -1 -2 -3
[2,] -4 -5 -6
> x <- cbind(a,b)+NA
> x
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] NA NA NA NA NA NA
[2,] NA NA NA NA NA NA
> x[,seq(from=1,by=2,len=3)] <- a
> x[,seq(from=2,by=2,len=3)] <- b
> x
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 1 -1 2 -2 3 -3
[2,] 4 -4 5 -5 6 -6
>
HTH
rksh
>
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>
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--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
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