Hi all,

I 'm doing the exercise given in the 'SDM with R' (Robert J. Hijmans and Jane Elith), chapter 4.2, regarding extracting values . I tried to do the same using my own data as well. Each cases i received the following error message ;

"Error in .xyValues(x, as.matrix(y), ...) : xy should have 2 columns only.

Found these dimensions:

Can some body explain me how to get rid of that? Thanks in advance.

champika

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