search for: r_unboundvalu

Reading "R Internals" made me believe that R_UnboundValue was a placeholder that would be skipped over in variable lookup. viz. the section of R Internals "Hash tables" says "items are not actually deleted but have their value set to R_UnboundValue.", which seems to align with what I read in envir.c. So, I reasoned, if I have a funct...

While poking around the C++ code in the dplyr package I ran across the idiom Rf_defineVar(symbol, R_UnboundValue, environment) to [sort of] remove 'symbol' from 'environment' Using it makes the R-level functions objects(), exists(), and get() somewhat inconsistent and I was wondering if that was intended. E.g., use SHLIB to make something from the following C code that dyn.load can load in...

Dear list, I have been using "findVar" (defined in src/main/envir.c) happily and would like to use "findFun". However I have trouble when the name searched cannot be found: while "findVar" returns R_UnboundValue, "findFun" does not (the 4 last lines of "findFun" are copied below). error(_("could not find function \"%s\""), CHAR(PRINTNAME(symbol))); /* NOT REACHED */ return R_UnboundValue; } I assume that the comment "/* NOT REACHED */ means that R...

...njunction. Both functions are different usages of the do_get C function, so it's a pity to run that twice. "get" gives an error when a symbol is not found, so you can't just do a 'get'. With R's C library, one might do SEXP x = findVarInFrame3(symbol,env); if (x != R_UnboundValue) { // do stuff with x } It would be very convenient to have something like this at the R level. We don't want to do any tryCatch stuff or to add args to get (That would kill any speed advantage. The overhead for handling redundant args accounts for 30% of the time used by "exists&quo...

...function, so it's a pity to run that > twice. > > > > "get" gives an error when a symbol is not found, so you can't just do a > > 'get'. With R's C library, one might do > > > > SEXP x = findVarInFrame3(symbol,env); > > if (x != R_UnboundValue) { > > // do stuff with x > > } > > > > It would be very convenient to have something like this at the R level. > We > > don't want to do any tryCatch stuff or to add args to get (That would > kill > > any speed advantage. The overhead for handling...

...ternatively, using Rf_findFun(...) seems OK in this context, but crashes if you call it with an unexisting function name. Rf_findVar does not crash in this case, but returns an unbound value. My workaround for now is as follows: fun = Rf_findVar(Rf_install(ident), R_GlobalEnv); if (fun != R_UnboundValue) { fun = Rf_findFun(Rf_install(ident), R_GlobalEnv); R_tryEval(fun, ...); } I did some checking on the R object pointers and indeed for generic functions Rf_findFun and Rf_findVar return different pointers (and therefore different function objects). What has changed with thes...

...t; different usages of the do_get C function, so it's a pity to run that twice. > > "get" gives an error when a symbol is not found, so you can't just do a > 'get'. With R's C library, one might do > > SEXP x = findVarInFrame3(symbol,env); > if (x != R_UnboundValue) { > // do stuff with x > } > > It would be very convenient to have something like this at the R level. We > don't want to do any tryCatch stuff or to add args to get (That would kill > any speed advantage. The overhead for handling redundant args accounts for > 30% of...

...n that > > twice. > > > > > > "get" gives an error when a symbol is not found, so you can't just do a > > > 'get'. With R's C library, one might do > > > > > > SEXP x = findVarInFrame3(symbol,env); > > > if (x != R_UnboundValue) { > > > // do stuff with x > > > } > > > > > > It would be very convenient to have something like this at the R level. > > We > > > don't want to do any tryCatch stuff or to add args to get (That would > > kill > > > any sp...

...TRUE, ifnotfound = NULL) .Internal(get0(x, envir, mode, inherits, ifnotfound)) >>>> As mentioned, the possibility of a >>>> NULL value is problematic. One solution is a sentinel value that indicates >>>> an unbound value (like R_UnboundValue). >>>> >>> >>> A null default is fine -- it's a default; if it isn't right for a >>> particular case you can provide something else. >>> [..................] >>> Adding getIfExists, or .get, or get0,...

...gt; If we do add an argument to get(), then it should be named consistently >>> with the ifnotfound argument of mget(). As mentioned, the possibility of a >>> NULL value is problematic. One solution is a sentinel value that indicates >>> an unbound value (like R_UnboundValue). >>> >> >> A null default is fine -- it's a default; if it isn't right for a >> particular case you can provide something else. >> >> >>> But another idea (and one pretty similar to John's) is to follow th...

...Lawrence wrote: > > If we do add an argument to get(), then it should be named consistently >> with the ifnotfound argument of mget(). As mentioned, the possibility of a >> NULL value is problematic. One solution is a sentinel value that indicates >> an unbound value (like R_UnboundValue). >> > > A null default is fine -- it's a default; if it isn't right for a > particular case you can provide something else. > > >> But another idea (and one pretty similar to John's) is to follow the >> SYMSXP >> design at the C level, where ther...

...* looking it up every time we need deal with transposing a multidimensional * intput/output look it up once here and save it off */ aperm_function = findFun(install("aperm"), R_GlobalEnv); if (aperm_function == NULL || aperm_function == R_NilValue || aperm_function == R_UnboundValue) { aperm_function = NULL; } else { aperm_expression = PROTECT(allocVector(LANGSXP, 2)); SETCAR(aperm_expression, aperm_function); } } ---------- SNIP ---------------- This now behaves appropriately from a child thread in my custom front end. thank you again Simon...

...* looking it up every time we need deal with transposing a multidimensional * intput/output look it up once here and save it off */ aperm_function = findFun(install("aperm"), R_GlobalEnv); if (aperm_function == NULL || aperm_function == R_NilValue || aperm_function == R_UnboundValue) { aperm_function = NULL; } else { aperm_expression = PROTECT(allocVector(LANGSXP, 2)); SETCAR(aperm_expression, aperm_function); } } ---------------------------------------- SNIP ------------------------------------------------------------------------------ but a...

If we do add an argument to get(), then it should be named consistently with the ifnotfound argument of mget(). As mentioned, the possibility of a NULL value is problematic. One solution is a sentinel value that indicates an unbound value (like R_UnboundValue). But another idea (and one pretty similar to John's) is to follow the SYMSXP design at the C level, where there is a structure that points to the name and a value. We already have SYMSXPs at the R level of course (name objects) but they do not provide access to the value, which is typically...

...' /home/test/proj/downl/R-1.7.0/bin/R.bin: /home/test/proj/downl/R-1.7.0/library/m ethods/libs/methods.so: can't resolve reference 'R_DotsSymbol' /home/test/proj/downl/R-1.7.0/bin/R.bin: /home/test/proj/downl/R-1.7.0/library/m ethods/libs/methods.so: can't resolve reference 'R_UnboundValue' Error in .Call("R_initialize_methods_metadata", table, PACKAGE = "methods") : .Call function name not in load table Execution halted *** Error code 1 Stop in /home/test/proj/downl/R-1.7.0/src/library/methods (line 70 of Makefile). *** Error code 1 Stop in /home/te...

Hi Jiefei and Duncan, I suspect what is likely happening is that one of ENSURE_NAMEDMAX or MARK_NOT_MUTABLE are being hit for x. These used to set named to 3, but now set it to 7 (ie the previous and current NAMEDMAX value, respectively). Because these are macros rather than C functions, its not easy to figure out why one of them is being invoked from do_isvector (a cursory exploration

Dear r-devel, I was surprised to see that saveRDS() and readRDS() work quite well with environments, see below: ``` z <- 3 # in global env y <- new.env() y$a <- 1 x <- new.env(parent = y) x$b <- 2 saveRDS(x, "x.RDS") # in a new session x <- readRDS("x.RDS") y <- parent.env(x) x$b #> [1] 2 y$a #> [1] 1 parent.env(y) #> <environment:

Hello. I've been trying to wrap up the R_NilValue into OCaml-R. I nevertheless get a segfault. As I gathered, R_NilValue is declared in Rinternals.h: > /* Special Values */ > LibExtern SEXP R_NilValue; /* The nil object */ > LibExtern SEXP R_UnboundValue; /* Unbound marker */ > LibExtern SEXP R_MissingArg; /* Missing argument marker */ So, in my r_data.c file, I have: -1- an #include directive. > #include <Rinternals.h> -2- the function wrapping R data in OCaml data > CAMLprim value Val_sexp (SEXP sexp) > { >...

...Jan 2015, Michael Lawrence wrote: > If we do add an argument to get(), then it should be named consistently > with the ifnotfound argument of mget(). As mentioned, the possibility of a > NULL value is problematic. One solution is a sentinel value that indicates > an unbound value (like R_UnboundValue). A null default is fine -- it's a default; if it isn't right for a particular case you can provide something else. > > But another idea (and one pretty similar to John's) is to follow the SYMSXP > design at the C level, where there is a structure that points to the name &gt...

.../usr/ucb/ld: Warning: Unresolved: TYPEOF Rf_error Rf_protect Rf_substitute Rf_unprotect Rf_duplicate Rf_VectorToPairList R_NilValue Rf_NewEnvironment R_set_standardGeneric_ptr R_GlobalEnv R_set_quick_method_check Rf_install Rf_allocVector LOGICAL R_PreserveObject Rf_mkChar SET_STRING_ELT Rf_findVar R_UnboundValue VECTOR_ELT R_NamesSymbol Rf_getAttrib Rf_length STRING_ELT R_CHAR R_do_slot Rf_asChar PRINTNAME Rf_isNull CAR CDR R_data_class Rf_isFunction Rf_findFun SETCAR Rf_eval INTEGER CLOENV Rf_findVarInFrame Rf_isSymbol ENCLOS SYMVALUE Rf_asLogical R_MissingArg Rf_isPrimitive do_set_prim_method BODY R_def...