Ayal Pinkus <[EMAIL PROTECTED]> writes: > Hi, > I am the maintainer of Yacas. I decided to join this mailing list > after having heard that > the option of linking R to Yacas was being discussed. Please don't > hesitate to ask > if you have questions, I will try to find the time to help. > Ayal
Interesting... Nice initiative! The thing that I wonder is whether it would be possible to embed Yacas at a lower level than via the parser. E.g. the Tcl embedding has Tcl_EvalObjEx() and friends, which operate on preparsed Tcl objects. Using this instead of Tcl_Eval() gives some efficiency gain, but more importantly, it avoids the "quoting hell" associated with the construction of the relevant command strings. Since both R and Yacas are "Lisp under the hood" languages (and Tcl too for that matter), it is a fairly good guess that their parse trees are similar, and that it would be a fairly simple task to translate back and forth between them. Well, between suitable subsets, at least. R's parse trees can in principle contain arbitrary R objects, but in this context, we might only need constants, names, operators, and function calls. It is probably not quite as easy as it sounds (is it ever?) but it could be worth it anyway. The main thing that it would require is an extended Yacas API which allows you to create Yacas objects from C code. -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
