The direct question seemed to be how to pass many optional parameters through, which seems obvious once you know it but the OP might not have seen it yet...
f1 <- function( x, y=1, z=2 ) { x*y + z } f2 <- function( x, ... ) { x <- x + 1 f1( x, ... ) } f2( 2, y=3 ) -- Sent from my phone. Please excuse my brevity. On August 7, 2017 7:16:42 PM PDT, Bert Gunter <bgunter.4...@gmail.com> wrote: >The S3 class model isn't really a class model. It's more a way of >overloading functions. So it's rather simple, and there's less there >than you might be expecting. I always thought the "Object Oriented >Programming" chapter of the R language definition manual that ships >with R was a very good treatment. Have you tried there? If not, please >do so. > >But surely you know how to search! (e.g. "S3 class system in R") -- >there are many good tutorials on the internet. Also search at >rseek.org, which is "optimized" for R queries. > >Cheers, >Bert > > > > >Bert Gunter > >"The trouble with having an open mind is that people keep coming along >and sticking things into it." >-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) > > >On Mon, Aug 7, 2017 at 5:06 PM, Kym Nitschke <kym.nitsc...@icloud.com> >wrote: >> Hi R Users, >> >> I am relatively new to programming in R … so I apologise if my >questions appear ‘dumb’. >> >> I am using a package that defines a number of S3 classes. I want to >create an S3 child class of one of these classes. The parent class has >a contractor with many arguments. I have been having difficulty writing >the child class contractor. I have been unable to find a good reference >in the internet for writing S3 classes. What I have been able to find >out so far is that the child class constructor should call the parent >class constructor … which in this case requires passing the argument >list with a variable number of arguments (i.e. there are a number of >optional arguments) from the child to the parent. >> >> So my first question is … is there an easy way to do this? The >match.call function will return a call object .. however the attributes >function when used on the call object returns a ‘NULL’. >> >> My second question is … can any one recommend a good reference for >object oriented programming in R which includes a comprehensive >discussion of the S3 class model? >> >> Thanks >> >> Regards, >> >> Kym >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> 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 -- To UNSUBSCRIBE and more, see >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 -- To UNSUBSCRIBE and more, see 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.