search for: classgets

...t bit. I suppose the correct way would be to do new(...)? This needs to be written down somewhere... The asymmetry is somewhat surprising though. 3) We have some C code which branches depending on the S4 class. The R extension doc didn't explain that one needs to do R_data_class() rather than classgets() (or 'getAttrib(x, RClassSymbol)') to retrieve S4 classes; further more, R_data_class() is not part of the public API, and I only found it by looking at the C code of 'class()' (do_class()). But R_data_class() is part of exposed binary interface and the methods package certainly us...

I get the error undefined symbol: Rf_rownamesgets when I try to load my package, which include C++ code that calls that function. This is particularly strange since the code also calls Rf_classgets, and it loaded OK with just that. Can anyone tell me what's going on? For the record, I worked around this with the general purpose attribute setting commands and R_RowNamesSymbol. I discovered that even with that I wasn't constructing a valid data.frame, and fell back to returning a l...

...); SET_VECTOR_ELT(out, 0, int_vect); PROTECT(names = NEW_CHARACTER(1)); SET_STRING_ELT(names, 0, COPY_TO_USER_STRING("integer.vector")); SET_NAMES(out, names); PROTECT(cls = NEW_CHARACTER(1)); SET_STRING_ELT(cls, 0, COPY_TO_USER_STRING("pushback")); classgets(out, cls); UNPROTECT(6); return out; } </CPP Code> <R Code> nreps=50000 allocate=FALSE sink("pushback_test.txt") test.pushback=.External("R_SimplePushBackTest", as.integer(nreps), as.logical(allocate)) print(test.pushback) sink() </R Code&g...

...he underlying integer value for each factor element. Equivalent to a match(x, levels) in R (x has already been converted to character at this point in the R function). Getting this to be performant would probably be annoying but is doable (e.g., via a hash table or some such) 3. Do classgets on the the output vector to make it a factor (this will set the object bit so you don't need to do that separate) 4. do setAttrib on the output vector to set the levels attribute (which now needs to be a STRSXP rather than, e.g., an array of const char*) 5. Return the output vect...

Hi, Using the R C PAI, is there a way to convert to convert STRSXP or INTSXP to factor. The idea would be to do in C something similar to the "factor" function (example below): > letters[1:5] # [1] "a" "b" "c" "d" "e" > factor(letters[1:5]) # [1] a b c d e # Levels: a b c d e There is the function setAttrib the levels of a SXP

...PROTECT(ans = allocVector(INTSXP, 1)); INTEGER(ans)[0] = ncon; PROTECT(class = allocVector(STRSXP, 2)); - SET_STRING_ELT(class, 0, mkChar("file")); + SET_STRING_ELT(class, 0, mkChar("gzfile")); SET_STRING_ELT(class, 1, mkChar("connection")); classgets(ans, class); UNPROTECT(2); ================================================================================ FIXED: Here's how the patched version operates: ## create two objects and serialize them to a gzfile > x <- 1:10 > y <- x^2 > f <- gzfile("tmp.dat", &q...

Thought I'd try and start a discussion. Feel free to jump in. I guess R needs to strike the right balance between opening up the internals to package writers and not allowing them to do bad things. My first attempt at cracking this nut is to just memcpy() the Rconnection and not allow access to the private stuff: /* Alternative to allowing C code access to connection API. */ Rconnection

man for `qr` says that the function uses LINPACK's DQRDC, while it in fact uses DQRDC2. ``` The QR decomposition of the matrix as computed by LINPACK or LAPACK. The components in the returned value correspond directly to the values returned by DQRDC/DGEQP3/ZGEQP3 ```

Hi folks. I posted this question a few days ago, but maybe it got lost because of the code I included with it. I'm having a problem using the SET_LENGTH() macro in an R extension I'm writing in C++. In a function within the extension I use SET_LENGTH() to resize R vectors so as to allow the concatenation of single values onto the vectors -- it's a "push back" function to

Thanks for looking into it, your approach sounds good to me. See also R_has_methods_attached() (https://github.com/wch/r-source/blob/42ecf5f492a005f5398cbb4c9becd4aa5af9d05c/src/main/objects.c#L258-L265). I'm fine with Rscript not loading "methods", as long as everything works properly with "methods" loaded but not attached. -Kirill On 19.04.2016 04:10, Michael

...able, but pointless as long as array.c- subset.c & others have a contrary version that leaves the -- attrib.c: /* FIXME: 1.e-5 should rather be == option('ts.eps') !! */ attrib.c- if (fabs(end - start - (n - 1)/frequency) > 1.e-5) -- attrib.c: /* FIXME : The whole "classgets" may as well die. */ attrib.c- -- attrib.c: /* FIXME */ attrib.c- if (nvalues <= 0) -- attrib.c: /* FIXME */ attrib.c- PROTECT(namesattr); -- attrib.c: /* FIXME: the code below treats pair-based structures */ attrib.c- /* in a special way. This can probably be dropped dow...

...locVector(INTSXP, 1)); INTEGER(ans)[0] = ncon; PROTECT(class = allocVector(STRSXP, 2)); - SET_STRING_ELT(class, 0, mkChar("textConnection")); + SET_STRING_ELT(class, 0, mkChar("loopConnection")); SET_STRING_ELT(class, 1, mkChar("connection")); classgets(ans, class); UNPROTECT(2); --- src/main/names.c.orig 2005-05-20 05:51:46.000000000 -0700 +++ src/main/names.c 2005-08-22 15:59:47.968828400 -0700 @@ -866,7 +866,7 @@ {"pushBack", do_pushback, 0, 11, 3, {PP_FUNCALL, PREC_FN, 0}}, {"clearPushBackLength",do_cl...

...TECT(ans = allocVector(INTSXP, 1)); INTEGER(ans)[0] = ncon; PROTECT(class = allocVector(STRSXP, 2)); - SET_STRING_ELT(class, 0, mkChar("textConnection")); + SET_STRING_ELT(class, 0, mkChar(con->class)); SET_STRING_ELT(class, 1, mkChar("connection")); classgets(ans, class); UNPROTECT(2); --- ./src/main/names.c.orig 2005-08-29 17:47:35.000000000 -0700 +++ ./src/main/names.c 2005-09-18 00:29:48.089651300 -0700 @@ -870,6 +870,7 @@ {"clearPushBack",do_clearpushback,0, 11, 1, {PP_FUNCALL, PREC_FN, 0}}, {"pushBackLength",do_...