Hello,
I am working my way through "A (not so) Short introduction to S4"
I created a class
setClass(Class = "Trajectories",
representation = representation(times = "numeric",traj = "matrix"))
and tried to build a method using
setMethod(
f = "plot",
signature = "Trajectories",
definition = function(X, y, ...){
matplot(x@times, t(x@traj), xaxt = "n", type = "l", ylab = "",
xlab = "", pch = 1)
axis(1, at = x@times)
}
)
R responds with an error message:
Creating a generic function for plot from package graphics in the
global environment
Error in conformMethod(signature, mnames, fnames, f, fdef, definition) :
in method for plot with signature x="Trajectories": formal arguments
(x = "Trajectories", y = "Trajectories", ... = "Trajectories") omitted in
the method definition cannot be in the signature
Did anything change in the transition to R-3.0?
is there any other, more recent introduction to S4 classes recommended?
Thank you
for your help.
Andreas
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