You might find http://adv-r.hadley.nz/s3.html to be helpful (in particular, http://adv-r.hadley.nz/s3.html#constructors-1, gives my advice about subclass constructors)
Hadley On Mon, Aug 7, 2017 at 7:06 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. -- http://hadley.nz ______________________________________________ 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.
