Dear List,



I want to compare the presence and absence of bird species based on the
sites in a matrix.

The matrix has 5 rows for Island A, B, C, D, and E.

It has 100 columns for bird species D001-D100.

In each cell of the matrix,

the presence-absence of bird species will be recorded as 1 or 0.

(For example, if species D001 is found on Island D,

the matrix cell of species D001 and Island D will be 1.)



Now I want to know the different bird species between Island B and E.

In other words, I would like to find out bird species present (1) on Island
B but absent (0)on island E, and vice versa (absent (0) on Island B but
present (1)on island E).



Please kindly advise how to code the purpose above.

Thank you in advance.



Elaine

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