Hallo!
Thanks too James Holtman, Douglas Grove, Uwe Ligges, Martin Maechler, for helpfull
answers
to my questions.
Sincerely
Eryk
*********** REPLY SEPARATOR ***********
On 5/25/2004 at 6:39 PM Martin Maechler wrote:
>>>>>> "Eryk" == Eryk Wolski <[EMAIL PROTECTED]>
>>>>>> on Tue, 25 May 2004 17:38:10 +0200 writes:
>
> Eryk> Hi!
> >> library(cluster)
> Eryk> In this lib a function called silhoutte.default is defined
> Eryk> than on the R prompt it type
> >> silhouette.default
> Eryk> Error: Object "silhouette.default" not found
> Eryk> R1.9.0
> Eryk> The same error are at R1.8.1
> Eryk> And I knew that a function silhoutte.default are present.
>
>Hi Eryk,
>
>please do learn about namespaces; many good R packages (incl.
>all standard and recommended packages) nowadays make use of
>namespaces, and we expect even more in the future.
>
>One big advantage of 'namespacing a package' is that
>you can make sure that your functions call your other functions
>even if they have the same name as someone's functions in
>another package. Another big "pro" is that you can use as many
>``package-internal'' objects {"helper-functions" in my useR talk}
>as you want: They won't be visible to the user and not clutter
>the global namespace.
>One side effect of namespaces: We usually do not export (S3)
>methods such as silhouette.default() :
>
>A user should call silhouette(...) and the method dispatching
>chooses the corresponding method.
>
>Now, to see "hidden" objects, you can
>
>1) use getAnywhere() { getAnywhere("silhouette.default") }
>2) use <namespace>:::<object> { cluster:::silhouette.default }
>
>and for S3 methods,
>
>3) getS3method("<generic>", "<class>")
>
> i.e., in this case getS3method("silhouette", "default")
>
>----------
>
>BUT: You won't see the source code of silhouette.default !
>
>Instead:
>
> 1) Learn how to get and unpack the package source and then
> see cluster/R/silhouette.R
>
> 2) if "1)" is too difficult,
> open the filename you get from
> system.file("../cluster/R/cluster")
> in a text editor -- preferably an R-aware one ...
> which gives you a large file with all R source from the
> cluster package. Now look for what you want.
>
>Regards,
>Martin Maechler <[EMAIL PROTECTED]> http://stat.ethz.ch/~maechler/
>Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
>ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
>phone: x-41-1-632-3408 fax: ...-1228 <><
Dipl. bio-chem. Eryk Witold Wolski @ MPI-Moleculare Genetic
Ihnestrasse 63-73 14195 Berlin 'v'
tel: 0049-30-83875219 / \
mail: [EMAIL PROTECTED] ---W-W---- http://www.molgen.mpg.de/~wolski
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