[R] Fwd: generic methods - in particular the summary function
Nobody wants to answer my question... is there something stupid in it? Début du message réexpédié : De : Christophe Dutang duta...@gmail.com Date : 19 septembre 2009 11:26:51 HAEC À : r-help@r-project.org Objet : generic methods - in particular the summary function Hi all, I'm currently working on the fitdistrplus package (that basically fit distributions). There is something I do not understand about the generic function summary. In the current version on CRAN, there is no NAMESPACE saying S3method(summary, fitdist) . However if we use summary on an object send by fitdist function it works fine... According to R-lang, we have The most common use of generic functions is to provide print and summary methods for statistical ob jects, generally the output of some model fitting process. To do this, each model attaches a class attribute to its output and then provides a special method that takes that output and provides a nice readable version of it. The user then needs only remember that print or summary will provide nice output for the results of any analysis. I would like to be sure, that if the summary.fitdist is not exported in the NAMESPACE, then we must use declare it with S3method. Thanks in advance Christophe -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Fwd: generic methods - in particular the summary function
Christophe Dutang wrote: Nobody wants to answer my question... is there something stupid in it? Maybe, or maybe just too much traffic on the lists these days. Début du message réexpédié : De : Christophe Dutang duta...@gmail.com Date : 19 septembre 2009 11:26:51 HAEC À : r-help@r-project.org Objet : generic methods - in particular the summary function Hi all, I'm currently working on the fitdistrplus package (that basically fit distributions). There is something I do not understand about the generic function summary. In the current version on CRAN, there is no NAMESPACE saying S3method(summary, fitdist) . However if we use summary on an object send by fitdist function it works fine... Yes, because your package's CRAN version does not have any namespace at all, hence nothing can be hidden in it. According to R-lang, we have The most common use of generic functions is to provide print and summary methods for statistical ob jects, generally the output of some model fitting process. To do this, each model attaches a class attribute to its output and then provides a special method that takes that output and provides a nice readable version of it. The user then needs only remember that print or summary will provide nice output for the results of any analysis. I would like to be sure, that if the summary.fitdist is not exported in the NAMESPACE, then we must use declare it with S3method. Right, and that's the way you should do it if you have a namespace (do not export the function but declare it as an S3 method). And yes, it is a good idea to add a namespace. Best, Uwe Ligges Thanks in advance Christophe -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Fwd: generic methods - in particular the summary function
On Sep 27, 2009, at 12:52 PM, Christophe Dutang wrote: Nobody wants to answer my question... is there something stupid in it? I couldn't really say. Not being a user of fitdistrplus I don't have much baseline experience. Had you posted code that produced something to work on, I might have made an effort at applying the methods I typically use, such as str(object), methods(function), and printing out the function code. But I am a rather low-level R-user, and as soon as you strart throwing around questions about NAMESPACE, my eyes glaze over and I move to the next question. When I do install and load fitdistrplus and then execute: methods(summary) .. I see a new function which is not even invisible, called summary.fitdist. So it seems to be in my NAMESPACE ... or at least what I dimly understand about such metaphysical entities. I get an error when I execute your suggestion: S3method(summary, fitdist) Error: could not find function S3method So I would have assumed that you had a package with that S3method function about which you had not informed us. Not sure this helps because, as I said, your question appeared more complex that I considered myself competent to answer. -- David Début du message réexpédié : De : Christophe Dutang duta...@gmail.com Date : 19 septembre 2009 11:26:51 HAEC À : r-help@r-project.org Objet : generic methods - in particular the summary function Hi all, I'm currently working on the fitdistrplus package (that basically fit distributions). There is something I do not understand about the generic function summary. In the current version on CRAN, there is no NAMESPACE saying S3method(summary, fitdist) . However if we use summary on an object send by fitdist function it works fine... According to R-lang, we have The most common use of generic functions is to provide print and summary methods for statistical ob jects, generally the output of some model fitting process. To do this, each model attaches a class attribute to its output and then provides a special method that takes that output and provides a nice readable version of it. The user then needs only remember that print or summary will provide nice output for the results of any analysis. I would like to be sure, that if the summary.fitdist is not exported in the NAMESPACE, then we must use declare it with S3method. Thanks in advance Christophe -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. David Winsemius, MD Heritage Laboratories West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Fwd: generic methods - in particular the summary function
Thanks for your answer. Yes, I use now a proper NAMESPACE with function declared correctly. Christophe Le 27 sept. 2009 à 19:16, David Winsemius a écrit : On Sep 27, 2009, at 12:52 PM, Christophe Dutang wrote: Nobody wants to answer my question... is there something stupid in it? I couldn't really say. Not being a user of fitdistrplus I don't have much baseline experience. Had you posted code that produced something to work on, I might have made an effort at applying the methods I typically use, such as str(object), methods(function), and printing out the function code. But I am a rather low-level R- user, and as soon as you strart throwing around questions about NAMESPACE, my eyes glaze over and I move to the next question. When I do install and load fitdistrplus and then execute: methods(summary) .. I see a new function which is not even invisible, called summary.fitdist. So it seems to be in my NAMESPACE ... or at least what I dimly understand about such metaphysical entities. I get an error when I execute your suggestion: S3method(summary, fitdist) Error: could not find function S3method So I would have assumed that you had a package with that S3method function about which you had not informed us. Not sure this helps because, as I said, your question appeared more complex that I considered myself competent to answer. -- David Début du message réexpédié : De : Christophe Dutang duta...@gmail.com Date : 19 septembre 2009 11:26:51 HAEC À : r-help@r-project.org Objet : generic methods - in particular the summary function Hi all, I'm currently working on the fitdistrplus package (that basically fit distributions). There is something I do not understand about the generic function summary. In the current version on CRAN, there is no NAMESPACE saying S3method(summary, fitdist) . However if we use summary on an object send by fitdist function it works fine... According to R-lang, we have The most common use of generic functions is to provide print and summary methods for statistical ob jects, generally the output of some model fitting process. To do this, each model attaches a class attribute to its output and then provides a special method that takes that output and provides a nice readable version of it. The user then needs only remember that print or summary will provide nice output for the results of any analysis. I would like to be sure, that if the summary.fitdist is not exported in the NAMESPACE, then we must use declare it with S3method. Thanks in advance Christophe -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. David Winsemius, MD Heritage Laboratories West Hartford, CT -- Christophe Dutang Ph.D. student at ISFA, Lyon, France website: http://dutangc.free.fr __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
