[R] unexpected results

[Peter Dalgaard BSA]

"Niels Waller" <niels.waller at vanderbilt.edu> writes:

> Is R behaving correctly in this example? I do not understand why column 2
> has any 2s in it (and why column 3 has any 1s)
> 
> 
> > x<-matrix(0,10,3)
> > x[seq(1,10,by=2),2:3]<-c(1,2)
> > x
>       [,1] [,2] [,3]
>  [1,]    0    1    2
>  [2,]    0    0    0
>  [3,]    0    2    1
>  [4,]    0    0    0
>  [5,]    0    1    2
>  [6,]    0    0    0
>  [7,]    0    2    1
>  [8,]    0    0    0
>  [9,]    0    1    2
> [10,]    0    0    0
> 
> Thank you for any and all help.
> 
> (I am using 1.5.0 on Windows NT)

c(1,2) is recycled and the 5x2 submatrix is filled by column.

You might try

x[seq(1,10,by=2),2:3]<-matrix(c(1,2),5,2,byrow=T)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
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