[R-sig-Geo] selection a right number in a sequance for a RS filter sampling

[Clint Bowman]

If I understand the sequence, you want the odd columns from the odd 
rows and the even columns from the even rows to "a" and the 
remainder go to "b".  Once you have a transposed matrix, the recipe 
looks straightforward.

Clint

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On Thu, 25 Feb 2010, gianni lavaredo wrote:

> dear Researcher
>
> Sorry that I know this is not the right email-list and this is a basic help
> but I am doing a remotesensing filter and I am honest, I have no idea how I
> can do this.
> I have a sequance form 1 to 16
>
> > seq(1:16)
> [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16
>
> and I wish to select this combination in a vector
> a <- c(1,3,6,8,9,11,14,16)
> b <- c(2,4,5,7,10,12,13,15)
>
> following the below example
>
>> t(matrix(data = seq(1:16), nrow = 4, ncol = 4))
>     [,1] [,2] [,3] [,4]
> [1,]    1    2    3    4
> [2,]    5    6    7    8
> [3,]    9   10   11   12
> [4,]   13   14   15   16
>
> gianni
>
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>
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