[Rd] Define S4 methods for 'plot'

cgenolin cgenolin at u-paris10.fr
Wed Nov 9 19:08:56 CET 2011

Hi the list
I am creating a package and I have a problem to define a S4 method for plot.
I define a class 'A' and a class 'B'. I want to define a function plot for
signature c(A,missing) and another method plot for signature c(A,B). My code
is the following :

In /package/R/ directory:
--- main.R ---
Aplot <- function(x,paramTraj=3){. . . .}

ABplot <- function(x,y,paramTraj=5){. . . .}

In the root directory /package/
exportMethods("plot",. . . .)
When I run the code (source("main.r")), every thinks works fine, either plot
on object of class 'A', on 'A,B' or on numeric plot(3). 

The R CMD check bug on an example using plot(3).
The R CMD build works just fine. But if I try to install the package from
the builded file, I get the message:
The following object(s) are masked from 'package:graphics':

And then, I cannot use the classical function plot: plot on object 'A'
works, but plot(1) does not.

I try, reading some recent post on r-devel to remove the line 'setGeneric'
but it does not works (which does not surprise me since getGeneric("plot")
gives a NULL results).
Any idea of what goes wrong?


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