Re: [Rd] Newbie Rccp module question. "Failed to initialize module pointer"???
Dirk, thanks for your reply. I posted my answer right away and went on vacation. My post was pending since then. Still cannot post, so I opened another profile -- maybe this time it gets through. To answer your questions, I run R-2.12.1 on 64 bit RedHat Linux on Xeon machine. What seems odd that the error message i am getting refers to .GlobalEnv package. The symbol it is looking for, _rcpp_module_boot_mod, is in shared library for my package, i checked it with nm. Is there any doc on how modules are implemented? -- View this message in context: http://r.789695.n4.nabble.com/Newbie-Rccp-module-question-Failed-to-initialize-module-pointer-tp3311388p3332652.html Sent from the R devel mailing list archive at Nabble.com. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] super basic questions about S4 classes
Apologies for asking something that is probably super obvious, i just started with S4 classes and i guess i am not finding documentation that layout the grammar rules and give enough examples. Some questions i am having are these 1. I understand that main method of writing a member function is to write a generic function and setMethod for this particular object. This, however, presumes that there is "virtuality" for this function, i.e. it could be used with other inherited classes . Truth is, many, if not most of my functions don't have virtuality in mind. I want to write them inside classes to achieve incapsulaton only -- use class member data without passing it as parameters or making global to a bunch of functions and have some specific class member functions that don't pollute a global namespace and can be called only for a particular class. This is what i know how to do with enclosures in R. Is there some obvious way of setting this environment local to a class without writing generic functions that i am missing? 2. Is it possible to overload functions in other ways than having default parameter values and prototypes? For example, can i have two constructors with completely different sets of parameters? 3. Is there some good way to debug S4 classes? I am very fond of mtrace() from debug package, but the simple set of commands i normally use doesn't take me into class methods. Would appreciate any pointers on these.. -- View this message in context: http://r.789695.n4.nabble.com/super-basic-questions-about-S4-classes-tp3428591p3428591.html Sent from the R devel mailing list archive at Nabble.com. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] S4 generic functions/methods vs enclosures
Apologies for asking something that is probably very obvious, i just started with S4 classes and i guess i am not finding documentation that lays out the grammar rules and gives enough examples. I understand that main method of writing a member function is to write a generic function and setMethod for this particular class. This, however, presumes that there is "virtuality" for this function, i.e. it could be used with other inherited classes . Truth is, many, if not most of my functions don't have virtuality in mind. I want to write them inside classes to achieve incapsulaton only -- use class member data without passing it as parameters or making global to a bunch of functions and have some specific class member functions that don't pollute a global namespace and can be called only for a particular class. This is what enclosured do in R. Is there some obvious way of setting this environment local to a class and without writing generic functions that i am missing? Would appreciate any pointers -- View this message in context: http://r.789695.n4.nabble.com/S4-generic-functions-methods-vs-enclosures-tp3430950p3430950.html Sent from the R devel mailing list archive at Nabble.com. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] S4 generic functions/methods vs enclosures
This looks awesome -- it is precisely what i wanted. I have started hacking with passing around environments to simulate behavior of classes i was after, but this is so much neater. Reference classes seem to do precisely what i wanted. Thank you very much. -- View this message in context: http://r.789695.n4.nabble.com/S4-generic-functions-methods-vs-enclosures-tp3430950p3431755.html Sent from the R devel mailing list archive at Nabble.com. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] How to debug reference classes?
How do you debug methods of a reference class? I've been using mtrace, which is excellent, but i cannot figure out how to mtrace a reference class method. Maybe there is some other way to debug these, for example with ordinary trace? for now i am only able to use options(error=recover), which is not giving me idea where exactly in the code i am once i am stopped on an error. -- View this message in context: http://r.789695.n4.nabble.com/How-to-debug-reference-classes-tp3434269p3434269.html Sent from the R devel mailing list archive at Nabble.com. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] How to debug reference classes?
Thank you very much, gentlemen. It seems reference classes will make my life much easier. I won't pretend that i fully understand the wizardry with environments that you do, but it works :). Namely the steps to mtrace a class method by doing what John and Mark outlined xx$edit<-xx$edit mtrace(edit, from=xx) xx$edit(1,1,99) do the magic of starting mtrace which solves my problem for practical purposes. I was not able to make the second part of prescription related to debugging unconstructed objects work. Namely, whenever i do mtrace( edit, from=mEditor$def@refMethods) I get Error in parent.env(from) : the empty environment has no parent. Must be doing something wrong, but haven't yet figured what. -- View this message in context: http://r.789695.n4.nabble.com/How-to-debug-reference-classes-tp3434269p3436674.html Sent from the R devel mailing list archive at Nabble.com. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] problem subsetting of a reference class
I am trying to define subset operator for a reference class and hitting some
problem i am unable to diagnose.To give an example, here is a toy class
generator that is a wrapper around a list
tmpGEN<-setRefClass("TMP", fields=list(
namelist="list"
))
tmpGEN$methods('add'=function(obj, name){
namelist[[name]]<<-obj
})
tmpGEN$methods('['=function(name){
if(class(name)!="character")
stop('to return cache element need to pass its
name')
ind<-match(name, names(namelist))
if(is.na(ind))
stop('data to remove is not in namelist')
namelist[[name]]
})
==
when i try to use it, the following happens
v<-rnorm(10)
tmp<-tmpGEN$new()
tmp$add(v, 'random')
. up until here everything is ok, class is generated and vector is
added. Now when i do
tmp['random']
i get error message
Error in tmp["random"] : object of type 'S4' is not subsettable
Not sure if it means that i cannot define "[" operator for a class or if i
am doing it syntactically wrong
--
View this message in context:
http://r.789695.n4.nabble.com/problem-subsetting-of-a-reference-class-tp3466690p3466690.html
Sent from the R devel mailing list archive at Nabble.com.
__
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] how to make a true binary package?
I'd like to have a version of a package that doesn't include sources. I thought that this could be achieved by using binary option in R CMD build, but in fact it packages source code that could be easily printed once the library is loaded. Is there an option to avoid visibility of the source? Another related question is how to install two versions of the same package, so that i could load either of them? I am sure this could be done, just cannot find this in docs. I am using R 2.12.1 on Red Hat Lunix -- View this message in context: http://r.789695.n4.nabble.com/how-to-make-a-true-binary-package-tp3895117p3895117.html Sent from the R devel mailing list archive at Nabble.com. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] how to make a true binary package?
OK, gentlemen, i agree with you in general. I was not talking about a general purpose, general use package that one prepares for CRAN. I am sure you are familiar professionally or can imagine situations where you need to demonstrate a solution to a specific task without fully disclosing the details -- sometimes even hard core open source adherents need to sacrifice desire for openness for some prosaic purposes, like getting paid :). Compilable languages give an easy solution of a binary code. It sounds like if one wants true binary, he has to recode in C++. I thought it's possible in R as well, i thought this was discussed even as a default behavior for next version of R to make stuff go faster. Maybe not. Thanks, anyway. -- View this message in context: http://r.789695.n4.nabble.com/how-to-make-a-true-binary-package-tp3895117p3895262.html Sent from the R devel mailing list archive at Nabble.com. __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
