remove black square from factor plot

str(species.factor)
 Factor w/ 81 levels "Acer_platanoides_Bl",..: 12 12 55 55 76 76 52 52 
67 67 ...

str(minmax)
 int [1:162] 6163779 7262127 6163779 7422941 6163779 6644861 6163779 
6644861 6163779 7262127 ...

On Oct 20, 2010, at 10:45 AM, fugelpitch wrote:

I have a factor which is species and the variables are a few sites 
where this
species live.

When I plot:

plot(species.factor, minlatitudemaxlatitude)

the plot produced is automatically a boxplot which shows the range of 
the
species (which is what I want).

This fact (a boxplot from the "plot" function) suggests that the 
objects you are plot()-ting are of some class for which there is a 
specific plot method. What do these commands return:

str(species.factor)
str(minlatitudemaxlatitude)     # ?

However, in the thin box which is produced by each species, there is 
a small
black square in "center position" of the box. Is it possible to 
remove this.
Have tried to include bxp(par(medpch=NA)) without success.

Thanks!

Jonas Josefsson

David Winsemius, MD
West Hartford, CT