Hello to the list
Some days ago, I placed a question on this maling-list and received an
answer from Martin
that I tried to follow. Unfortunately, I am still puzzled by the next step.
I spent the whole Week-end in gathering information from the net.
Some of them are almost contridtcory and I lack a good document to help me.
So my first question would beL Is there a convenient document which tells
a standard user, who laready developped a package with S3, on how to migrate
to the S4 mechanism.
Secondly, this is my problem:
According to Martin, now I use a NAMESPACE (as follows):
import (methods)
exportPattern("^[^0]*$")
exportMethods(
"[","[<-","$","$<-",
"plot","print"
)
exportClasses(
"anam","db","model","rule","vardir","vario","tokens","thresh"
)
useDynLib("RGeoS")
importFrom(graphics,plot)
More over, in the R directory, I have a zzz.lib with the following
contents (.onLoad) :
".onLoad" <-
function(...)
{
# Define the Classes #
All0.Classes()
# Define the environment variables #
environ.load()
}
The file All0.Classes (which will not be exported ... see exportPattern)
contains
all the class definitions (setClass functions)
Finally, I have some other functions, such as db.plot, which contain the
following statement
(at the end of the file):
setMethod("plot", signature(x="db"), function(x,y,...) db.plot(x,...))
My questions:
- Should the setMethods be regrouped in a single file (as I read from
the net).
- What are the differences between "R CMD check" and "R CMD INSTALL" as
far as the steps are involved.
As a matter of fact:
- R CMD check finds that everything is OK
- R CMD INSTALL gives me a set of warnings of the following type:
Warning in matchSignature(signature, fdef, where) :
in the method signature for function "[<-" no definition for class: "db"
I did not use the Collate option (that Martin suggested) as I am not
sure of its syntax and where I should add these statements.
The package works fine anyhow but I would like to correct these warnings.
By the way, as I belong to an institute where we use Fedora Core 8, I am
stuck with R 2.8.0.
An ultimate problem: I develop two packages P1 and P2 where P2 requires P1.
So I used the same architecture for both with NAMESPACE and .onLoad
functions (in the zzz.lib files).
For P2, I mention that it depends upon P1 in the DESCRIPTION file. This
information seems redundant with the NAMESPACE where I can add
"import(P1)". Finally when, as a user, I load both by library() (first
P1 then P2), I receive a message about function .onLoad being loaded twice.
How can I avoid this.
As you can see, I encountered several problems when converting my S3
into S4. I would appreciate if someone could give me a complete
information and a godd reference.
Thanks in advance.
--
Didier RENARD
Centre de Geosciences / Geostatistique
Ecole des Mines de Paris
35 Rue St Honore
77300 Fontainebleau
Tel: (1) 64 69 47 80
Fax: (1) 64 69 47 05
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