Try this indeed of as.matrix(...) :

B <- B[-1,, drop = FALSE]


On Sat, Apr 17, 2010 at 3:25 PM,  <mauede@alice.it> wrote:
> After some headache with debugging my script, I finally isolated the
problem taht I am going to illustrate in the following example.
> I expected matrix nrow to decrease consistently till 1. Instead, when the
matrix is left with one row only, its nrow jumps to 2 because the matrix
> gets transposed. How come ?
> Thank you,
> Maura
>
>> B <- c(1,2)
>>  B <- rbind(B,c(3,4))
>>  B <- rbind(B,c(5,6))
>>  B
>  [,1] [,2]
> B    1    2
>     3    4
>     5    6
>> dim(B)
> [1] 3 2
>> nrow(B)
> [1] 3
>>
>> #REMOVE ROW-1 OUT OF 3
>>  B <- as.matrix(B[-1,])
>>  B
>  [,1] [,2]
>    3    4
>    5    6
>> dim(B)
> [1] 2 2
>> nrow(B)
> [1] 2
>>
>> #REMOVE ROW-2 OUT OF 3
>>  B <- as.matrix(B[-1,])
>>  B
>     [,1]
> [1,]    5
> [2,]    6
>> dim(B)
> [1] 2 1
>> nrow(B)
> [1] 2
>
>
>
> tutti i telefonini TIM!
>
>
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>
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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