[R] Script to count unique values from two linked matricies

Tue Sep 25 14:56:54 CEST 2012

Fantastic help - thanks guys.

Heramb, Pikal and Rui all came up with solutions.

I prefer Rui's as it seems the simplest.

I'm going to try and work through them to understand exactly what's going on at each stage.

Thanks again all,

Ben Gillespie
Research Postgraduate

School of Geography
University of Leeds
Leeds
LS2 9JT

Tel: +44(0)113 34 33345
Mob: +44(0)770 868 7641
http://www.geog.leeds.ac.uk/
________________________________________
From: Heramb Gadgil [heramb.gadgil at gmail.com]
Sent: 25 September 2012 10:38
To: Benjamin Gillespie
Cc: arun; r-help at r-project.org
Subject: Re: [R] Script to count unique values from two linked matricies

We can have something like this;

Data1<-data.frame(Site1=c(5,NA,4),Site2=c(3,2,4),Site3=c(NA,5,NA))
Data2<-data.frame(TraitType1=c(1,2,3),TraitType2=c(2,4,2),TraitType3=c(5,1,1))

rownames(Data1)<-paste("Species",1:3)

rownames(Data2)<-paste("Species",1:3)

User_Defined=function(dat1,dat2){c1=ncol(dat1)

out=NULL

dummy=lapply(1:c1,function(x){step1=dat1[,x]

step2=dat2[which(is.na<http://is.na>(step1)==F),]

step3=length(unlist(apply(step2,2,unique)))

out<<-c(out,step3)

})

Final<-data.frame(TraitRichness=out)

rownames(Final)<-paste('Site',1:3)

Final_Table<<-Final

}

User_Defined(Data1,Data2)

Final_Table

I hope this is what you need.

Best,
Heramb

On Tue, Sep 25, 2012 at 1:41 PM, Benjamin Gillespie <gybrg at leeds.ac.uk<mailto:gybrg at leeds.ac.uk>> wrote:
Hi,

Thanks for helping me with this one.

To save you time, the following is the code for the tables I uploaded as jpegs that you may not have received:

dat1<-data.frame(Species=paste("Species",1:3),Site1=c(5,NA,4),Site2=c(3,2,4),Site3=c(NA,5,NA))
dat2<-data.frame(Species=paste("Species",1:3),TraitType1=c(1,2,3),TraitType2=c(2,4,2),TraitType3=c(5,1,1))
dat3<-data.frame(Site=paste("Site",1:3),Trait_Richness=c(5,7,3))

So,

I have two matricies, dat1 and dat2.

Dat1 is a species abundance matrix. Dat2 is a species trait matrix.

I want to create dat3 through use of a script.

Dat 3 is a count of unique traits observed at each site. i.e. at site 1, species 1 and 3 are present (ass seen in dat1). Species 1 has traits: 1, 2 and 5 for trait types 1, 2 and 3 respectively. Species 3 has traits: 3, 2 and 1 for trait types 1, 2 and 3 respectively.

So, at site 1:

For trait type 1, 2 unique traits were observed. For trait type 2, 1 unique trait was observed (both species 1 and 3 were classed as "1") and for trait type 3, 2 unique traits (trait richness) were observed; thus, 2+1+2=5.

and so on... so at site 2, all three species were observed...

For trait type 1, 3 unique traits were observed (1, 2, 3), for trait type 2, 2 unique traits were observed (2, 4, 2) and for trait type 3, 2 unique traits were observed (5, 1, 1). So, for site 2, trait richness is 7 (3+2+2) traits.

I hope this helps to explain, please let me know if you need any further information,

Ben Gillespie
Research Postgraduate

School of Geography
University of Leeds
Leeds
LS2 9JT

Tel: +44(0)113 34 33345
Mob: +44(0)770 868 7641
http://www.geog.leeds.ac.uk/
________________________________________
From: arun [smartpink111 at yahoo.com<mailto:smartpink111 at yahoo.com>]
Sent: 24 September 2012 19:36
To: Benjamin Gillespie
Subject: Re: [R] Script to count unique values from two linked matricies

HI Ben,

Sorry,I couldn't understand how you counted the trait richness.  Could you elaborate?
A.K.

----- Original Message -----
From: benrgillespie <gybrg at leeds.ac.uk<mailto:gybrg at leeds.ac.uk>>
To: r-help at r-project.org<mailto:r-help at r-project.org>
Cc:
Sent: Monday, September 24, 2012 7:47 AM
Subject: [R] Script to count unique values from two linked matricies

I hope you can help with this one.

I have two matricies:

1. A species abundance matrix:

<http://r.789695.n4.nabble.com/file/n4643979/2species_matrix.jpg>

2. A species trait score matrix:

<http://r.789695.n4.nabble.com/file/n4643979/2trait_matrix.jpg>

The trait matrix lists trait scores for each species as listed in the
species abundance matrix.

I would like to create a script that would effectively count the unique
traits (trait richness) for each site and produce an output like this:

<http://r.789695.n4.nabble.com/file/n4643979/trait_richness.jpg>

Firstly, is this possible in R? Secondly, if so, how would you go about
writing a script to achieve my aim?

Many thanks in advance, please let me know if you need further information.

Ben Gillespie (Research Postgraduate)

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