[R] Inheritance for S3 classes

[Jeff Newmiller]

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.4567 at 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.nitschke at 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
>> ______________________________________________
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>
>______________________________________________
>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.