Ulrike Groemping <[EMAIL PROTECTED]> wrote: >I have defined a class "myclass" and would like the slots to be extractable >not only by "@" but also by "$". I now try to write a method for "$" that >simply executes the request [EMAIL PROTECTED], whenever someone calls >object$slotname for any object of class "myclass". >I don't manage to find out how I can provide this function with "slotname", >so that one and the same function works for any arbitrary slotname a user >might choose. >...
I would caution against defining methods for $. In addition to Martin Maechler and Duncan Temple Lange's warnings about the danger of this, I would note that it could make R run much slower. I once tried defining a method for it in S-PLUS; that converted $ into a generic function, which slowed down every call to $, of which there are many. Even if it wouldn't slow down R, as we work to make R and S-PLUS more compatible you or someone else might try your code in S-PLUS, and cause a big speed hit. >Maybe I could (and should?) have defined the class with just one slot >that contains the list, which would make it behave like I want it >immediately. Why not make it a list with an S3 class, rather than an S4 class? Tim Hesterberg ======================================================== | Tim Hesterberg Research Scientist | | [EMAIL PROTECTED] Insightful Corp. | | (206)802-2319 1700 Westlake Ave. N, Suite 500 | | (206)283-8691 (fax) Seattle, WA 98109-3012, U.S.A. | | www.insightful.com/Hesterberg | ======================================================== Download the S+Resample library from www.insightful.com/downloads/libraries Two Research Scientist positions: data mining frailty/mixed effects http://www.insightful.com/company/jobs.asp Speak out about biased science in Washington D.C. http://home.comcast.net/~timhesterberg/ScientificIntegrity.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html