Rewrite _argcheck for readability. Remove references to self.xa and self.xb as they don't seem necessary.
Rewrite _argcheck for readability. Remove references to self.xa and self.xb as they don't seem necessary.

weecology/macroecotools,weecology/macroecotools,rueuntal/macroecotools,rueuntal/macroecotools