[R-sig-Geo] Testing if a point-pattern is on a regular grid

[Pierre Roudier]

Thanks Roger.

Exactly what I was looking for.

Pierre

2010/1/6 Roger Bivand <Roger.Bivand at nhh.no>:
> 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.Bivand at nhh.no
>
>