[EMAIL PROTECTED] wrote:
> Full_Name: Stefan Albrecht
> Version: 2.2.0
> OS: Windows XP
> Submission from: (NULL) (194.127.2.74)
>
>
> Dear all,
>
> in the new R 2.2.0, the matrix indexing has been changed.
I just tried your code in R 2.0.1 and 2.1.1, and got the same output as
you did. Which version are you comparing to?
Duncan Murdoch
In my opinion, this
> leads to an inconsistency when indexing one-row matrices.
> Take
>
>>(mat <- matrix(1:9, nrow = 3, dimnames = list(paste("r", 1:3, sep = ""),
>
> paste("c", 1:3, sep = ""))))
> c1 c2 c3
> r1 1 4 7
> r2 2 5 8
> r3 3 6 9
>
> Now taking the first row of the first-row of mat preserves the column names
>
>>mat[1, , drop = FALSE][1, ]
>
> c1 c2 c3
> 1 4 7
>
> This is not true for the first column of the first-row of mat
>
>>mat[1, , drop = FALSE][, 1]
>
> [1] 1
>
> However, for the first column of the first two rows of mat the row names are
> retained
>
>>mat[1:2, , drop = FALSE][, 1]
>
> r1 r2
> 1 2
>
> This feature can lead to problems when indexing matrixes of different row
> numbers, since the row names are not preserved in all cases.
>
> I suggest to preseve the row names also for
>
>>mat[1, , drop = FALSE][, 1]
>
>
> Would it be possible to implement this feature? Many thanks.
>
> With best regards,
>
> Stefan Albrecht
>
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