Dear all,

I'm trying to understand the S4 way of object-oriented programming, but I
still can't grasp completely what R is doing. I have a class definition for
a class called PM10Meteo, and I set a initializer function. next, I include
a show method and a print method as shown below.

setClass( Class="PM10Meteo",...) # end setClass

setMethod ("initialize",signature="PM10Meteo",...) # end setMethod

########
# Show Method
#
setMethod("show","PM10Meteo",
  function(object){
...
  } # end function
) # end show method

#######
# Print Method
#

setMethod("print","PM10Meteo",
  function(x,n=400,station=F,values=T,meteo=T,...){
...
  }
) # end print method

Now when I run the complete class definition file, neither the method
"initialize" nor the method "show" occur in the list given by ls(). On the
other hand, the method "print" does! So when I use rm(list=ls()) I still
have the "initialize" and "show" method, but the "print" method is gone. Am
I forgetting something somewhere? It's rather inconvenient to have to run
the definition files every time I want to clear the memory.

Cheers
Joris
-- 
Joris Meys
Statistical Consultant

Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control

Coupure Links 653
B-9000 Gent

tel : +32 9 264 59 87
Joris.Meys@Ugent.be
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