[R] convert vector to matrix

[David Barron]

cbind always produces a matrix or data frame.  What the FAQ says is
that a subsetting operation *on* a matrix will result in redundant
dimensions being
dropped, not that you can't get a matrix with a "redundant" dimension
as a result of a function.

So,
> vec<-1:10
> vec
 [1]  1  2  3  4  5  6  7  8  9 10
> cbind(vec)
      vec
 [1,]   1
 [2,]   2
 [3,]   3
 [4,]   4
 [5,]   5
 [6,]   6
 [7,]   7
 [8,]   8
 [9,]   9
[10,]  10
> mat<-cbind(vec)
> dim(mat)
[1] 10  1
> mat[,1]
 [1]  1  2  3  4  5  6  7  8  9 10

takes us back to a vector again.

On 04/10/06, Alberto Monteiro <albmont at centroin.com.br> wrote:
> Gavin Simpson wrote:
> >
> > Did you even try to use cbind on your vector? I guess not as,
> >
> > > vec <- 1:10
> > > mat <- cbind(vec)
> > > mat
> >
> Why does mat remain a matrix instead of "losing" one dimension?
> I am reading the FAQ at...
> http://cran.us.r-project.org/doc/FAQ/R-FAQ.html#Why-do-my-matrices-lose-
> dimensions_003f
> ... and it seems that anything you do to mat should turn it back
> into a one-dimensional vector.
>
> Alberto Monteiro
>
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>


-- 
=================================
David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP