Undocumented S4 methods: generic coerce and siglist matrix, Massvector

Hi,
While checking the package I am getting all the time the following 
complain about the function:


Undocumented S4 methods:
 generic coerce and siglist matrix,Massvector


I have not defined the function nowhere in the R files.
My gues is that this has something to do with the following definition 
of the setAs function.

setAs("matrix","Massvector"
     ,def= function(from)
     {
       return(new("Massvector",from))
     }
     )

It certainly does.  From the documentation of setAs():

----------------
With this explanation as background, the function setAs does a fairly 
obvious computation: It constructs and sets a method for the function 
coerce with signature c(from, to), using the def argument to define the 
body of the method.
-------------------

The problem is not to cheat the check mechanism. I knew that the warning
can be elminitad by by defining an alias of this function in one of the 
Rd files.

No cheating seems needed.  The setAs() call is part of your software & 
presumably you document it somewhere.  You do have to construct the 
corresponding alias in the same .Rd file, but it doesn't amount to cheating.

It's true that a user would have to be unusually well-informed to know 
how to ask for the corresponding documentation explicitly.

Yours

Eryk