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quadrat.test()

2 messages · emason, Roger Bivand

Original
emason
# 
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.

Thank You,

Erin K.
2 days later
Roger Bivand
#
On Mon, 2 Apr 2007, emason wrote:

            

      
      
      
    

        
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.