[R-sig-Geo] quadrat.test()

[Roger Bivand]

On Mon, 2 Apr 2007, emason wrote:

> Hello,  I stumbled upon an respones you write regarding the quadrat()  
> function in R.  I have been manhandling it all day and I still cannot  
> get quadrat() or quadrat.test() to work for me.  I keep getting this  
> errror:
> 
> Error in quadrat.count.engine(X$x, X$y, b$xbreaks, b$ybreaks) :
>          xbreaks do not span the actual range of x coordinates in data
> 
> Does this mean anything to you?  I am at a total loss.

Please always include the command giving the error message in your 
posting, otherwise we have to guess.

Looking at the code and ?quadrat.test, and trying:

data(simdat)
simdat
quadrat.test(simdat)

works, but if xbreaks= is set outside x's range:

quadrat.test(simdat, xbreaks=seq(-10,0,1))

your error appears. So you are setting an inappropriate xbreaks= argument, 
or possibly have an inappropriate window in your ppp object.

> 
> Thank You,
> 
> Erin K.
> 
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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