[R] Rank Values in a Matrix

[Doran, Harold]

Whoops, I inadvertently created a dataframe called aa and not a matrix,
so the code below assumes aa is a dataframe and not a matrix. 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Doran, Harold
> Sent: Monday, May 19, 2008 8:15 AM
> To: Jens Oldeland; r-help at stat.math.ethz.ch
> Subject: Re: [R] Rank Values in a Matrix
> 
> If your matrix below is called aa, you could do this
> 
> > matrix(rank(aa, ties='min'), ncol=ncol(aa))
>      [,1] [,2] [,3] [,4]
> [1,]    4    8    1   11
> [2,]   14   11   11    5
> [3,]   15    5    5    1
> [4,]   15    8    8    1
> 
> This doesn't assign the values you list, but it does rank 
> them. OTOH, if you want as you have below, I think this works
> 
> rank(unique(stack(aa)[1]))-1
> 
> > -----Original Message-----
> > From: r-help-bounces at r-project.org
> > [mailto:r-help-bounces at r-project.org] On Behalf Of Jens Oldeland
> > Sent: Monday, May 19, 2008 7:47 AM
> > To: r-help at stat.math.ethz.ch
> > Subject: [R] Rank Values in a Matrix
> > 
> > Dear All,
> > 
> > a short and maybe simple question:
> > 
> > 
> > I have to rank all values in a matrix from 0 to X,
> > 
> >     [1]   [2] [3]  [4]
> > [1] 0.1  2   0    3
> > [2] 50   3   3    1
> > [3] 100 1   1    0
> > [4] 100  2  2    0
> > 
> > 0->0
> > 0.1->1
> > 2->2
> > 3->3
> > 50->4
> > 100->5  (X=5)
> > 
> > is there any function for this? i have looked in several packages 
> > (vegan, labdsv etc.) because I am working with species by 
> site tables, 
> > but without success. perhaps I looked for the wrong terms 
> (rank matrix 
> > etc.)
> > 
> > thank you for your help
> > 
> > regards,
> > Jens
> > 
> > --
> > +++++++++++++++++++++++++++++++++++++++++
> > Dipl.Biol. Jens Oldeland
> > University of Hamburg
> > Biocentre Klein Flottbek and Botanical Garden Ohnhorststr. 18
> > 22609 Hamburg,
> > Germany
> > 
> > Tel:    0049-(0)40-42816-407
> > Fax:    0049-(0)40-42816-543
> > Mail: 	Oldeland at botanik.uni-hamburg.de
> >         Jens.Oldeland at DLR.de  (for attachments > 2mb!!) 
> > http://www.biologie.uni-hamburg.de/bzf/fbda005/fbda005.htm
> > +++++++++++++++++++++++++++++++++++++++++
> > 
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> 
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>