[Rd] convoluted namespace problem

[Paul Gilbert]

I have a work around for this, but either I don't understand something 
(again) or it is a bug ...
I have an S3 generic  function "periods" defined in package tframe and 
exported from its namespace, and a method "periods.TSdata" defined in 
package dse1 and set as an S3method in its namespace. It uses another 
generic function  "periodsOutput" defined in dse1 and exported from the 
dse1 namespace.  From package dse2, which does not yet have a namespace, 
I call periods with a TSdata object and this fails  "couldn't find 
periods.TSdata".  Is this user error or a bug? (Details below.)

Thanks,
Paul Gilbert
________

R : Copyright 2004, The R Foundation for Statistical Computing
Version 2.0.0  (2004-10-04), ISBN 3-900051-07-0
 ...
 

>> require("dse1")
>  
>
Loading required package: dse1
Loading required package: tframe
Loading required package: setRNG
[1] TRUE

>> periods(TSdata(output=matrix(1:20,10,2)))
>  
>
Error in periods.TSdata(TSdata(output = matrix(1:20, 10, 2))) :
        couldn't find function "periods.TSdata"

>> traceback()
>  
>
2: periods.TSdata(TSdata(output = matrix(1:20, 10, 2)))
1: periods(TSdata(output = matrix(1:20, 10, 2)))

>> periods
>  
>
function (x)
UseMethod("periods")
<environment: namespace:tframe>

>> dse1:::periods.TSdata
>  
>
function (x, ...)
UseMethod("periodsOutput")
<environment: namespace:dse1>

>> dse1:::periodsOutput
>  
>
function (x)
UseMethod("periodsOutput")
<environment: namespace:dse1>

>>
>  
>