[R] Confusing concept of vector and matrix in R
ggrothendieck at gmail.com
Tue Mar 30 04:48:32 CEST 2010
Actually R looks at it the other way around. It regards a matrix as a
special case of a vector. A vector has no dimensions. A vector with
dimensions is an array. An array with two dimensions is a matrix.
Try using drop=FALSE like this:
m <- matrix(1:6, 3)
m[, 2, drop = FALSE]
On Mon, Mar 29, 2010 at 7:13 PM, yehengxin <xye78 at hotmail.com> wrote:
> Why does R need the concept of "Vector"? In my opinion, it is a useless and
> confusing concept. A vector is simply a special case of a matrix whose row
> or column number is equal to 1. When I take submatrix from one matrix and
> if row or column number is 1, R will automatically convert it into a vector.
> It is very straightforward that a submatrix of a matrix should be a matrix.
> In each time, I have to use as.matrix() to convert the vector back to
> matrix. It is very annoying!
> View this message in context: http://n4.nabble.com/Confusing-concept-of-vector-and-matrix-in-R-tp1707170p1707170.html
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> and provide commented, minimal, self-contained, reproducible code.
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