Dear list,

I want to retrieve a specific data from a matrix with 3000 columns.
The matrix has island ID as its rows and species ID as its columns.
There are 20 rows and 3000 columns in the matrix.
(Island ID: Species 1- Species 20/ species ID: Species 1- Species 3000)
The contents of the matrix grids is 1 or 0, for presence and absence.

Now I would like to check in Island 1 which species is 1. (Island 1 as row
2)
Please kindly advise how to code the command and thank you in advance.

Elaine

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