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 how many species are found in (1, presence) for
Island A, Island D, and Island L respectively.
Please kindly advise the R code for the search purpose.
Thank you.
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