

  Dear All,

  This is regarding symbols function. I'm preparing a graph for different species in a plot (based on the coordinate x & y). I  used inches in symbol function to indicate the different symbols size based on the size class (in diameter of tree trunk). The problem is that the symbol size is arrange in descending order. So the symbol for two species with different number of size class will have the same symbol size for the largest of each species diameter class (descending order). If the species A has 3 size class (e.g 10,20,30); and another species B has 5 size class (10,20,30,40,50), the symbols size display is the same for species A is the same as symbol size for species B for size class 30,40,50. How can I solve the problem?

  Example of my program code:
  ....
  dbhcat=cut(spdata$dbh,breaks=c(10,50,100,300,600,100000),labels=c(1,2,3,4,5))
      symbols(spdata$gx,spdata$gy,dbhcat,inches=c(0.05,0.1,1.5,2.0,2.5,3.0),add=TRUE)
  ........

  Abd. Rahman Kassim, PhD
  Forest Management & Ecology Program
  Forestry & Conservation Division
  Forest Research Institute Malaysia
  Kepong 52109 Selangor
  Malaysia

  Fax: 603-62729852
  Tel: 603-62797179

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