similar to: How to maintain memory in R extension

Dear all, I have wrapped a C++ function in an R package. I allocate/deallocate memory using C++ 'new' and 'delete'. In order to allow user interrupts without memory leaks I've moved all the delete statements required after an interrupt to a separate C++ function freeMemory(), which is called using on.exit() just before the .C() call. I am concerned about the

I'm just curious. Why making "if" generic is even more dangerous? Best, Da On Sat, Mar 4, 2017 at 1:22 PM, G?bor Cs?rdi <csardi.gabor at gmail.com> wrote: > `!` is a generic, `if` is not. You can define an `if` that is generic, > but this might be even more dangerous.... > > ? `if` <- function(a, b, c) UseMethod("if") > ? `if.default` <-

On Sun, Mar 5, 2017 at 2:50 PM, Michael Lawrence <lawrence.michael at gene.com> wrote: > > > On Sat, Mar 4, 2017 at 12:36 PM, Da Zheng <zhengda1936 at gmail.com> wrote: >> >> In my case, I create a new type of matrices and override matrix >> operations in R for these matrices. >> My goal is to make the system as transparent as possible, which means

In my case, I create a new type of matrices and override matrix operations in R for these matrices. My goal is to make the system as transparent as possible, which means my system should execute the existing R code without modification. The problem is that when data is in my own vectors or matrices, "if" or "while" can't access their values unless we explicitly convert them

Thanks. Can I override it for a specific class? I can do that for operators such as "!". For example, "!.fm" works for objects of the class "fm". It seems I can't do the same for "if". Best, Da On Sat, Mar 4, 2017 at 12:41 PM, G?bor Cs?rdi <csardi.gabor at gmail.com> wrote: > You can. Perhaps needless to say, be careful with this. > > ?

My question is based on a project I have partially done, but there is still something I'm not clear. My goal is to create a R package contains GPU functions (some are from Nividia cuda library, some are my self-defined CUDA functions) My design is quite different from current R's GPU package, I want to create a R object (external pointer) point to GPU address, and run my GPU function

Dear R .Call() insiders, Can someone enlighten me how to properly finalize external pointers in C code (R-2.5.1 win)? What is the relation between R_ClearExternalPtr and the finalizer set in R_RegisterCFinalizer? I succeeded registering a finalizer that works when an R object containing an external pointer is garbage collected. However, I have some difficulties figuring out how to do that in an

Given an externalptr object 'pool' which protects an R object 'prot': # SEXP prot = (a dynamically updated list with handles) SEXP pool = R_MakeExternalPtr(p, R_NilValue, prot); R_RegisterCFinalizerEx(pool, fin_pool, TRUE); WRE explains that 'prot' remains in existence as long as 'pool' is around. Does this also mean 'prot' still exists when the

> OK - seems you might want to take a few steps back & understand how > C++ code is written/structured generally (and/or take a look at other > parts of the compiler). You'll need a header file with the declaration > of your function & you can include that header file in the > hashtable.cpp and testing.cpp - if that sentence doesn't make sense to > you yet, please

I can't comment for Da, but one example where the ability to make 'if' generic would have been desirable: A couple of years ago I wrote S3 classes and methods for 1-byte integers and logicals stored as raw vectors, in order to handle massive amounts of genetic data (by the standards of the day). Everything worked pretty nicely, ie I could "methodize" just about everything I

Hello All, I am new to programming, i have little problem with hash. I want to retrieve first 10 items(key value pairs) from given hash{} hashTable = {"a" => 1, "b" => 5, "c" => 2, "d" => 6, "e" => 4, "f" => 7, "g" => 9, "h" => 5, "i" => 1, "j" => 8, "k"

On Thu, Jul 25, 2013 at 11:40 AM, Abhinash Jain <omnia at mailinator.com> wrote: > I have one file named hashtable.cpp whose link is > "http://pastebin.com/Cq2Qy50C" > > and one llvm pass named testing.cpp whose link is > "http://pastebin.com/E3RemxLF" > > Now on this testing.cpp pass I have computed the string named "expr" which I > want

Hello, I'm trying to submit my package to CRAN. When I read the policy, it says: Package authors should make all reasonable efforts to provide cross-platform portable code. Packages will not normally be accepted that do not run on at least two of the major R platforms. What major R platforms does this policy refer to? Currently, my package runs in Ubuntu. If it works on both Ubuntu and

I have one file named hashtable.cpp whose link is "http://pastebin.com/Cq2Qy50C" and one llvm pass named testing.cpp whose link is "http://pastebin.com/E3RemxLF" Now on this testing.cpp pass I have computed the string named "expr" which I want to pass to the function named hashtable(string) in hashtable.cpp (on line 106 of testing.cpp) > looking at simple

WRE explains that R_alloc() can be used to allocate memory which automatically gets released by R at the end of a .C, .Call or .External, even in the case of an error or interruption. This is a really great feature to prevent memory leaks. I was wondering if there is a way to extend this mechanism to allow for automatically running UNPROTECT and custom finalizers at the end of a .Call as well.

Dear R users, I want to perform an exact permutation of multisets. I have looked at the coin package, but it doesn't seem to offer what I am looking for. I want to perform permutations (exact - without duplications) on multisets of scalars (e.g., the multiset 0,0,1,2,2). I want to output all the possible permutations into a data frame so that each multiset permutation occupies a row (or

I have some C data I want to pass back to R opaquely, and then back to C. I understand external pointers are the way to do so. I'm trying to find how they interact with garbage collection and object lifetime, and what I need to do so that the memory lives until the calling R process ends. Could anyone give me some pointers? I haven't found much documentation. An earlier message

Hi, To write a "constructor" for an S4 object, you make an initialize method which will be called by new. But how would I make a "destructor" method to be called when the S4 object is garbage collected? I'm looking at reg.finalizer, but I'm not sure how to make that work for an S4 object. I want to write a destructor because my S4 object's initialize method

Hello, I heard we can override almost everything in R. Is it possible to override "if" keyword in R to evaluate my own object instead of a logical value? Thanks, Da

Hello, I'm trying to override pmin and pmax for my own matrix. These two functions have ... as an argument. I tried to override them as follows: setMethod("pmax", class_name, function(x, ..., na.rm) { ... }) I use this way to override primitive functions such as min/max and it works fine. But it doesn't work for pmin and pmax. I guess because they are regular functions? How