[R] sort matrix based on a specific order

[jim holtman]

more complete example


> mat<-cbind(c('w','x','y','z'),c('a','b','c','d'))
> matOrd <- mat[order(factor(mat[,2], levels = c('c', 'b', 'd','a'))), ]
> matOrd
     [,1] [,2]
[1,] "y"  "c"
[2,] "x"  "b"
[3,] "z"  "d"
[4,] "w"  "a"
>



On Thu, Jan 10, 2013 at 1:21 PM, array chip <arrayprofile at yahoo.com> wrote:
> Hi I have a character matrix with 2 columns A and B, If I want to sort the matrix based on the column B, but based on a specific order of characters:
>
> mat<-cbind(c('w','x','y','z'),c('a','b','c','d'))
> ind<-c('c','b','d','a')
>
> I want "mat" to be sorted by the sequence in "ind":
>
>      [,1] [,2]
> [1,] "y"  "c"
> [2,] "x"  "b"
> [3,] "z"  "d"
> [4,] "w"  "a"
>
> Is there any simple function that can do this?
>
> Thanks
>
> John
>
>         [[alternative HTML version deleted]]
>
>
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-- 
Jim Holtman
Data Munger Guru

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Tell me what you want to do, not how you want to do it.