On Wed, 6 Jan 2010, Pierre Roudier wrote:
Dear list,
I'm looking for an easy way to test if a point pattern (I got a data
frame of x and y coordinates) is on a regular grid or not.
I'm aware of the gridded() function in sp(), but this function is
devoted to assign rather than to test, as far as I know. I'm pretty
sure there's an easy way to do that though....
Use try(points2grid()) - if this returns an object of class "try-error",
the points do not lie on a grid.
Roger
Any suggestions ?
Thanks,
Pierre
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: roger.biv...@nhh.no
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