[R] Splitting an array into two - alternate columns

[Peter Dalgaard BSA]

Phil Rhoades <philr at mail.austasia.net> writes:

> I want to split an array (A1) into two arrays using alternate columns eg
> 
> A2 would consist of:
> 
> A1[,1], A1[,3], A1[,5], . .
> 
> A3 would consist of:
> 
> A1[,2], A1[,4], A1[,6], . .
> 
> Anyone got a nice method?

How about

k <- ncol(A1)
A2 <- A1[,seq(1,k,2)]
A3 <- A1[,seq(2,k,2)]

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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