You want `drop=FALSE`:
> dim(ThinMatrix[TRUE, , drop=FALSE])
[1] 6 1
>From ?"[":
drop: For matrices and arrays. If ‘TRUE’ the result is coerced to
the lowest possible dimension (see the examples). This only
works for extracting elements, not for the replacement. See
‘drop’ for further details.
And R inferno 8.1.44:
http://www.burns-stat.com/pages/Tutor/R_inferno.pdf
Gabor
On Wed, Aug 6, 2014 at 11:07 AM, Terrence Ireland <ky...@his.com> wrote:
> There seems to be a result type difference when subscripting a 6 x 1 matrix
> as compared to a 3 x 2 matrix that is caused by the ncol = 1 compared to
> ncol > 1.
>
>> ThinMatrix <- matrix(1:6,ncol=1)
>> ThinMatrix
> [,1]
> [1,] 1
> [2,] 2
> [3,] 3
> [4,] 4
> [5,] 5
> [6,] 6
>> FatMatrix <- matrix(1:6,ncol=2)
>> FatMatrix
> [,1] [,2]
> [1,] 1 4
> [2,] 2 5
> [3,] 3 6
>> dim(ThinMatrix[TRUE,])
> NULL #Though this value should be 6 1
>> dim(FatMatrix[TRUE,])
> [1] 3 2
>
> Thanks for your help.
>
> Terry Ireland
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
