[R] search species with all absence in a presence-absence matrix

[John Kane]

Once you learn to use dput() I am sure someone will be happy to help you.

 http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

John Kane
Kingston ON Canada


> -----Original Message-----
> From: elaine.kuo.tw at gmail.com
> Sent: Sat, 21 Sep 2013 07:14:38 +0800
> To: r-help at r-project.org
> Subject: [R] search species with all absence in a presence-absence matrix
> 
> Dear list
> 
> 
> 
> I have a matrix composed of islandID as rows and speciesID as columns.
> 
> IslandID: Island A, B, C?.O (15 islands in total)
> 
> SpeciesID: D0001, D0002, D0003?.D0100 (100 species in total)
> 
> 
> 
> The cell of the matrix describes presence (1) or absence (0) of the
> species
> in an island.
> 
> 
> 
> Now I would like to search the species with absence (0)
> 
> in all the islands (Island A to Island O.)
> 
> 
> 
> Please kindly advise the R code for the search purpose.
> 
> Thank you.
> 
> 
> 
> Elaine
> 
> 	[[alternative HTML version deleted]]
> 
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