I want to get the data in a circle from a large square plot.
If the data includes only two columns or more columns which is number style,
I can do it.
But if the data includes other columns which is not number style (e.g.
species name), I donot know how to do it. And I donot want to delete the
columns because it is useful to me.
e.g. species x y
a 12 20
b 20 50
c 14 25
... ... ...
Thanks!
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