similar to: Using unicode from C interface of R

Hi , For our production package i need to create a dataframein C . So I wrote the following code SEXP dfm ,head,df , dfint , dfStr,lsnm; *SEXP valueVector[2];* char *ab[3] = {"aa","vv","gy"}; int sn[3] ={99,89,12}; char *listnames[2] = {"int","string"}; int i,j; //============================= PROTECT(df = allocVector(VECSXP,2));

Hi , I am trying to create a dataframe in C and sebd it back to R. Can anyone point me to the part of the source code where it is doing , let me explain the problem I am having . -------------------------------------------------------------------- My simple implementation is like this SEXP formDF() { SEXP dfm ,df , dfint , dfStr,lsnm; char *ab[3] =

Hi , I want to know is this behavior expected and why is that ? Need some help gender <- c("F", "M", "M", "F", "F", "M", "F", "F") > age <- c(23, 25, 27, 29, 31, 33, 35, 37) > df<- data.frame(gender,age) > typeof(df[[1]]) [1] "integer"

Hi guys, I've got a question about the API mkchar(). I have met some difficulty in parsing utf-8 string to mkchar() in R-2.7.0. I was intending to parse an utf-8 string str_jan (some Japanese characters such as?, whose utf-8 code is E381B5) to R API SEXP mkChar(const char *name) , we only need to create the SEXP using the string that we parsed. Unfortunately, I found when parsing the

Hi , I am asking too many questions , sorry for that . I am creating a data frame in C itself , reading a table . The data frame calling code looks like this ====================================== *PROTECT(dfm=lang2(install("data.frame"),df));* *SEXP res = PROTECT(eval(dfm,R_GlobalEnv));* UNPROTECT(2); return res; ================================== It works fine , now the problem

I would like to propose that Rf_mkString(NULL) and Rf_mkChar(NULL) return NA rather than segfault. Case: the mkString() and mkChar() functions are convenient to wrap strings returned by e.g. external C libraries into an R vector. However sometimes a library returns NULL instead of a string when the result is unavailable. In some C libraries this can happen unexpectedly or is even undocumented. A

Can we use the "bytes" encoding for such environment variables invalid in the current locale? The following patch preserves CE_NATIVE for strings valid in the current UTF-8 or multibyte locale (or non-multibyte strings) but sets CE_BYTES for those that are invalid: Index: src/main/sysutils.c =================================================================== --- src/main/sysutils.c

Hi , I have installed R on my system and the user access control looks like this -rwxr-x*---* 1 root root 10578117 Feb 3 11:26 libR.so I have installed R as root , but the access control for other is not enabled by default ( at least Read option) . This can be solved using linux ways, but I am interested to know if there is any way to mention while we run R or install R packages. What I am

Hi , I am running R from C using the interpreter . Now i execute detach("package:td", unload=TRUE) And I get the following error . Any idea what it means ? *** caught segfault *** address 0x102, cause 'memory not mapped' Traceback: 1: sys.parent() 2: sys.function(sys.parent()) 3: formals(sys.function(sys.parent())) 4: match.arg(event) 5: packageEvent(pkgname,

Hi , Is there any C API to the R API nrow of dataframe ? x<- data.frame() n<- nrow(x) print(n) 0 Example : My C function which deals with data frame looks like and I don't to send the number of rows of data frame .I want to detect it from the function itself, my function take data frame as argument and do some on it. I want API equivalent to nrow. I tried Rf_nrows,Rf_ncols . No

/Hello. SUMMARY: $ BOOM=$'\xFF' LC_ALL=en_US.UTF-8 Rscript --vanilla -e "Sys.getenv()" Error in substring(x, m + 1L) : invalid multibyte string at '<ff>' $ BOOM=$'\xFF' LC_ALL=en_US.UTF-8 Rscript --vanilla -e "Sys.getenv('BOOM')" [1] "\xff" BACKGROUND: I launch R through an Son of Grid Engine (SGE) scheduler, where the R

Full_Name: Partho Bhowmick Version: 2.8.1 OS: Windows XP Submission from: (NULL) (199.43.48.131) While trying to install package sn (I have tried multiple mirrors), I get the following message trying URL 'http://www.revolution-computing.com/cran/bin/windows/contrib/2.8/sn_0.4-10.zip' Content type 'application/zip' length 320643 bytes (313 Kb) opened URL downloaded 313 Kb

Hi , I am trying to call head function from C . My doubt is with the parameter n,how to pass it . PROTECT(dfm=lang3(install("data.frame"),df,ScalarLogical(FALSE))); SET_TAG(CDDR(dfm), install("stringsAsFactors")) ; SEXP res = PROTECT(eval(dfm,R_GlobalEnv)); PROTECT(head=lang3(install("head"),res,ScalarInteger(1))); head = PROTECT(eval(head,R_GlobalEnv)); I tried

Hi, As was discussed earlier in another thread and as documented in R-exts .Call() should not be interruptible by Ctrl-C. However the following code, which spends most of its time inside mkChar, turned out to be interruptible on RH-7.3 R-1.8.1 gcc-2.96: #include <Rinternals.h> #include <R.h> SEXP foo0(const SEXP nSexp) { int i, n; SEXP resSexp; if (!isInteger(nSexp))

Hi, I am trying to figure a way to allocate a string SEXP so that gc() won't ever collect it. Here is a little bit of a background. Suppose I want to write a .Call-callable function that upon each call returns the same value, say mkChar("foo"): SEXP getFoo() { return mkChar("foo"); } The above implementation doesn't take advantage of the fact that

Hi, I want to read a text file into R with .Call(). So I define some NEW_CHARACTER() to store the chracters read and use SET_STRING_ELT to fill the elements. e.g. PROTECT(qNames = NEW_CHARACTER(10000)); char *foo; // This foo holds the string I want. while(foo = readLine(FN)){ SET_STRING_ELT(qNames, i, mkChar(foo))); } In this way, I can get the desired character from qNames. The only problem

The R script I run daily for hours looks like this: while (!finish) { Sys.sleep(0.1) time = as.integer(format(Sys.time(), "%H%M")) # always crash here if (new.data.timestamp() <= time) next # ... do some jobs for about 2 minutes ... gc() } Basically it waits for new data, which comes in every 10 minutes, and do some jobs, then gc(), then loop again. It

I am occasional getting "Segmentation Fault - core dumped" in R 0.62.3 (I think more often then I did in 0.62.2). I have not been able to do this in any reliably reproducible way yet, but thought I would mention the problem in case some else can isolate it. Paul Gilbert -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read

I believe IO in R is slow because of the way it is implemented, not because it has to do some extra work for the user. I compared scan() with 'what' argument set (which is, AFAIK, is the fastest way to read a CSV file) to an equivalent C code. It turned out to be 20 - 50 times slower. I can see at least two main reasons why R's IO is so slow (I didn't profile this though): A) it

Hi, To speed up reading of large (few million lines) CSV files I am writing custom read functions (in C). By timing various approaches I figured out that one of the bottlenecks in reading character fields is the mkChar() function which on each call incurs a lot of garbage-collection-related overhead. I wonder if there is a "vectorized" version of mkChar, say mkChar2(char **, int