[R-pkg-devel] Creating Accessor Methods
All, I have a package with to S4 classes (MBSCashFlow, REMICCashFlow and BondCashFlow) all of which contain the slot Duration. I would like have an accessor Duration that would work on multiple signatures. Is this possible? I have checked my books, help, BioConductor tutorials and it appears that this is not possible. Has anyone ever run into this situation? Best Glenn __ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
Re: [R-pkg-devel] Creating Accessor Methods
Hi Glenn,
that is actually as easy as defining a generic and defining a method for
each class to extract the slot. I do this literally in every package I
write.
setGeneric('duration', function(x, ...) standardGeneric('duration')
setMethod('duration', signature = 'MBSCashFlow', function(x) { x@Duration})
setMethod('duration', signature = 'REMICCashFlow', function(x) {x@Duration})
etc...
I suggest you take a close look at Hadley Wickham's books 'Advanced R' and
'R packages', both freely available online.
This is the relevant section of the first book :
http://adv-r.had.co.nz/OO-essentials.html
This is the other book : http://r-pkgs.had.co.nz/
Cheers
Joris
On Thu, Mar 10, 2016 at 3:05 PM, Glenn Schultz wrote:
> All,
>
> I have a package with to S4 classes (MBSCashFlow, REMICCashFlow and
> BondCashFlow) all of which contain the slot Duration. I would like have an
> accessor Duration that would work on multiple signatures. Is this
> possible? I have checked my books, help, BioConductor tutorials and it
> appears that this is not possible. Has anyone ever run into this situation?
>
> Best Glenn
> __
> R-package-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>
--
Joris Meys
Statistical consultant
Ghent University
Faculty of Bioscience Engineering
Department of Mathematical Modelling, Statistics and Bio-Informatics
tel : +32 9 264 59 87
joris.m...@ugent.be
---
Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
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Re: [R-pkg-devel] Creating Accessor Methods
Hi Glenn! On 10/03/16 15:05, Glenn Schultz wrote: I have a package with to S4 classes (MBSCashFlow, REMICCashFlow and BondCashFlow) all of which contain the slot Duration. I would like have an accessor Duration that would work on multiple signatures. Is this possible? I have checked my books, help, BioConductor tutorials and it appears that this is not possible. Has anyone ever run into this situation? I actually use a similar mechanism to extract values from different S4 classes in my package, and it works quite well. So if I understand you right, the following code might help you to get closer to want you want: https://github.com/52North/sos4R/blob/master/R/SOS-methods-accessor.R I created methods for different signatures, see for example "sosObservedProperties". Hope this helps, Daniel -- Daniel Nüst Institute for Geoinformatics (ifgi), University of Münster Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 31962 http://ifgi.uni-muenster.de/~d_nues01http://o2r.info __ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
Re: [R-pkg-devel] Creating Accessor Methods
On 10.03.2016 16:48, Daniel Nüst wrote: Hi Glenn! On 10/03/16 15:05, Glenn Schultz wrote: I have a package with to S4 classes (MBSCashFlow, REMICCashFlow and BondCashFlow) all of which contain the slot Duration. I would like have an accessor Duration that would work on multiple signatures. Is this possible? I have checked my books, help, BioConductor tutorials and it appears that this is not possible. Has anyone ever run into this situation? I actually use a similar mechanism to extract values from different S4 classes in my package, and it works quite well. So if I understand you right, the following code might help you to get closer to want you want: https://github.com/52North/sos4R/blob/master/R/SOS-methods-accessor.R I created methods for different signatures, see for example "sosObservedProperties". Yes, that's straightforward. But I still wonder if it is at all possible to use not only different *signatures*, but also different argument *names* in S4, e.g.: foo(formula, data, ...) foo(data, grouping, ...) Now I'm using a combination of S3 and S4 in my package for this purpose, and for some other quirks. Thomas -- Dr. Thomas Petzoldt Technische Universitaet Dresden Faculty of Environmental Sciences Institute of Hydrobiology 01062 Dresden, Germany E-Mail: thomas.petzo...@tu-dresden.de http://tu-dresden.de/Members/thomas.petzoldt __ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
Re: [R-pkg-devel] Creating Accessor Methods
Hello Joris,
Thank worked perfectly. My main concern was that I was creating multiple
methods which may have the same name but different signature. Just over
thinking things I guess but I appreciate your time answering my question.
Glenn
> On Mar 10, 2016, at 8:13 AM, Joris Meys wrote:
>
> Hi Glenn,
>
> that is actually as easy as defining a generic and defining a method for each
> class to extract the slot. I do this literally in every package I write.
>
> setGeneric('duration', function(x, ...) standardGeneric('duration')
>
> setMethod('duration', signature = 'MBSCashFlow', function(x) { x@Duration})
> setMethod('duration', signature = 'REMICCashFlow', function(x) {x@Duration})
> etc...
>
> I suggest you take a close look at Hadley Wickham's books 'Advanced R' and
> 'R packages', both freely available online.
>
> This is the relevant section of the first book :
> http://adv-r.had.co.nz/OO-essentials.html
>
> This is the other book : http://r-pkgs.had.co.nz/ > wrote:
> All,
>
> I have a package with to S4 classes (MBSCashFlow, REMICCashFlow and
> BondCashFlow) all of which contain the slot Duration. I would like have an
> accessor Duration that would work on multiple signatures. Is this possible?
> I have checked my books, help, BioConductor tutorials and it appears that
> this is not possible. Has anyone ever run into this situation?
>
> Best Glenn
> __
> R-package-devel@r-project.org mailing
> list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>
>
>
>
> --
> Joris Meys
> Statistical consultant
>
> Ghent University
> Faculty of Bioscience Engineering
> Department of Mathematical Modelling, Statistics and Bio-Informatics
>
> tel : +32 9 264 59 87
> joris.m...@ugent.be
> ---
> Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
>
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Re: [R-pkg-devel] Creating Accessor Methods
Creating functions that looks like they have the same name, but have
different internals is exactly (one of) the purposes of having methods.
Best,
Kasper
On Thu, Mar 10, 2016 at 4:04 PM, Glenn Schultz wrote:
> Hello Joris,
>
> Thank worked perfectly. My main concern was that I was creating multiple
> methods which may have the same name but different signature. Just over
> thinking things I guess but I appreciate your time answering my question.
>
> Glenn
>
> > On Mar 10, 2016, at 8:13 AM, Joris Meys wrote:
> >
> > Hi Glenn,
> >
> > that is actually as easy as defining a generic and defining a method for
> each class to extract the slot. I do this literally in every package I
> write.
> >
> > setGeneric('duration', function(x, ...) standardGeneric('duration')
> >
> > setMethod('duration', signature = 'MBSCashFlow', function(x) { x@Duration
> })
> > setMethod('duration', signature = 'REMICCashFlow', function(x)
> {x@Duration})
> > etc...
> >
> > I suggest you take a close look at Hadley Wickham's books 'Advanced R'
> and 'R packages', both freely available online.
> >
> > This is the relevant section of the first book :
> http://adv-r.had.co.nz/OO-essentials.html <
> http://adv-r.had.co.nz/OO-essentials.html>
> > This is the other book : http://r-pkgs.had.co.nz/ <
> http://r-pkgs.had.co.nz/>
> >
> > Cheers
> > Joris
> >
> > On Thu, Mar 10, 2016 at 3:05 PM, Glenn Schultz > wrote:
> > All,
> >
> > I have a package with to S4 classes (MBSCashFlow, REMICCashFlow and
> BondCashFlow) all of which contain the slot Duration. I would like have an
> accessor Duration that would work on multiple signatures. Is this
> possible? I have checked my books, help, BioConductor tutorials and it
> appears that this is not possible. Has anyone ever run into this situation?
> >
> > Best Glenn
> > __
> > R-package-devel@r-project.org
> mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-package-devel <
> https://stat.ethz.ch/mailman/listinfo/r-package-devel>
> >
> >
> >
> > --
> > Joris Meys
> > Statistical consultant
> >
> > Ghent University
> > Faculty of Bioscience Engineering
> > Department of Mathematical Modelling, Statistics and Bio-Informatics
> >
> > tel : +32 9 264 59 87
> > joris.m...@ugent.be
> > ---
> > Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php <
> http://helpdesk.ugent.be/e-maildisclaimer.php>
>
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>
> __
> R-package-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>
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