With a bit of meta programming that manipulates expressions, I don’t think this would be difficult to implement in a package. Well, as difficult as it is to implement a CAS, but not harder. I wrote some code for symbolic differentiation — I don’t remember where I put it — and that was easy. But that is because differentiation is just a handful of rules and then the chain rule. I don’t have the skills for handling more complex symbolic manipulation, but anyone who could add it to the language could also easily add it as a package, I think.
Whether in a standard package or not, I have no preference whatsoever. Cheers Thomas On 25 May 2019 at 00.59.44, Abby Spurdle (spurdl...@gmail.com<mailto:spurdl...@gmail.com>) wrote: > Martin Maechler has asked me to send this to R-devel for discussion > after I submitted it as an enhancement request ( > https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17563). I think R needs to provide more support for CAS-style symbolic computation. That is, support by either the R language itself or the standard packages, or both. (And certainly not by interfacing with another interpreted language). Obviously, I don't speak for R Core. However, this is how I would like to see R move in the future. ...improved symbolic and symbolic-numeric computation... I think any changes to formula objects or their methods, should be congruent with these symbolic improvements. [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
