[R] how to re-shape a matrix

[Sarah Goslee]

Thanks for the reproducible example.

Because this mixes numeric and character data, it's better done as a
data frame than a matrix.


> data.frame(rowind=as.vector(row(m)), colind=as.vector(col(m)), value = as.vector(m))
   rowind colind value
1       1      1     a
2       2      1     b
3       1      2     c
4       2      2     d
5       1      3     e
6       2      3     f
7       1      4     g
8       2      4     h
9       1      5     i
10      2      5     j

Sarah

On Wed, Apr 3, 2013 at 5:28 PM, Hui Du <Hui.Du at dataventures.com> wrote:
>
> Hi All,
> I have a matrix like
> m <- matrix( letters[1:10], ncol=5)
>
> How to conver it to  10 * 3 matrix, which the first col is row index of m, second col is colum index of m and third column is the value of matrix, say
>
> 1        1   1    "a"
>
> 2        1   2   "c"
> 1  3  "e"
> etc...
> Thanks.
>
>


--
Sarah Goslee
http://www.functionaldiversity.org