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Hello, Since people have whisperred about Rcpp, I'd like to play too. > On 11/15/2010 07:45 AM, Patrick Leyshock wrote: >> Very helpful, thank you. >> >> A couple other questions, please: >> >> 1. I've got a function written in C, named "my_c_function". In my R >> code I call this function, passing to it an INTSXP and a STRSXP, >> respectively: >&gt...

A question, please about development of R packages: Are there any guidelines or best practices for deciding when and why to implement an operation in R, vs. implementing it in C? The "Writing R Extensions" recommends "working in interpreted R code . . . this is normally the best option." But we do write C-functions and access them in R - the question is, when/why is this

I'm trying to configure Version 2.12.0 or R to do memory profiling. I've reconfigured the code: % ./compile --enable-memory-profiling=YES and verified that it's configured correctly by examining the output. I then rebuild R: % make Then I fire up R and run a script, using Rprof with the memory-profiling switch set to TRUE: Rprof("output", memory.profiling=TRUE); # a

Hello, Are there any good tools available for monitoring the performance of R? I'm wanting to capture things such as time elapsed in evaluating an expression, memory usage over time (or operation), and so on. I could build my own but would like to follow established practice, if there is one. Thank you, Patrick [[alternative HTML version deleted]]

Hello, I'm trying to access an object, given only its name as a symbol. I cannot figure out how to proceed. Suppose I call substitute( ) on the expression 'x + 2': > parse.tree <- substitute(x + 2); The constituents of parse.tree are of type symbol and numeric: > str(parse.tree[[1]]) symbol + > str(parse.tree[[2]]) symbol x > str(parse.tree[[3]]) num 2 Suppose

I have an external pointer object that I'd like to pass from my R code to some C code. Per Section 5.13 of "Writing R Extensions", I've noted that "external pointers should only be used as part of an object with normal semantics, for example an attribute or an element of a list." So I've written up a workable C function as such: SEXP my_c_function(SEXP param)

Hello, I've created this class: setClass("example", representation ( size = "numeric", id = "character" ) ) Suppose I create a new instance of this class: > x <- new("example", 4, "id_value") This creates an S4 object with two slots. Am I correct in thinking that slots are "filled" by SEXPs?

Is there any way to format the headers of data frames, for printing? I am using Sweave to generate formatted reports. In Sweave, I read in a data.frame: result <- read.table(path.to.table); then display it: print.data.frame(result); This gives me what I expect in the eventual final output: Record Average Maximum 1 34

...running at 100% cpu for one hour ... (Mike Marchywka) 27. hierarchical mixture modelling (Mike Lawrence) 28. Check for is.object (Santosh Srinivas) 29. Fast Two-Dimensional Optimization (Wonsang You) 30. Re: plotting a timeline (?ukasz R?c?awowicz) 31. Re: memory profiling (Patrick Leyshock) 32. Re: ?summaryRprof running at 100% cpu for one hour ... (Kjetil Halvorsen) 33. Re: An empty grey diagram (Martin Maechler) 34. Re: ?summaryRprof running at 100% cpu for one hour ... (Mike Marchywka) 35. Re: Check for is.object (Jonathan P Daily) 36. Re: solve nonlinear equ...