[R] taking data out of a dataframe

[NICOLAS DEIG]

hello,

I have a problem with using the results of a certain function.
This function is the "tree" function. If I use it to produce a tree say
with the data "iris" from the help page, I can see the "attributes" of
my result. Now I need to use a column of the attributes of my tree
ir.tr, is there any way or function that permits me to take this column out?
THanks in advance
Nicolas