# [R] sort matrix based on a specific order

jim holtman jholtman at gmail.com
Thu Jan 10 19:26:35 CET 2013

Define them as factors with a specified order for your sorting.

e.g.

x <- factor(your_data, levels = c('c', 'b','d', '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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> and provide commented, minimal, self-contained, reproducible code.
>

--
Jim Holtman
Data Munger Guru

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