search for: rf_lang1

...2.0 xn <- foo(rnorm(100),mu) > typeof(attr(xn,"mu")) [1] "symbol" > eval(attr(xn,"mu")) [1] 2 > In a .Call, I am attempting to eval the SYMSXP as follows: SEXP mu_ = Rf_getAttrib(x_,Rf_install("mu")); if(TYPEOF(mu_)==SYMSXP) { mu_ = Rf_eval(Rf_lang1(mu_),R_GlobalEnv); } However, when running this code, I get the following error: Error in logp(xn) : could not find function "mu" Do I need to create an expression of c("get", "mu") to force the name lookup to evaluate the SYMSXP? Thanks, Whit

...t;>>>> much for >>>>>>>> Rcpp. >>>>>>>> >>>>>>> >>>>>>> I don't think so. In the situation that Dominick is describing the C >>>>>>> API is being used (calls to Rf_install, Rf_lang1, Rf_eval, ...) and >>>>>>> you have to play by the rules of the C API. Essentially every time >>>>>>> that you call a function in the C API that can cause a memory >>>>>>> allocation you are open yourself to the possibility of having th...

...ls.so nls.o ld: Warning: Unresolved: fabs sqrt R_finite Rf_error R_GlobalEnv R_NamesSymbol Rf_coerceVector Rf_allocMatrix Rf_allocVector Rf_asInteger Rf_asLogical Rf_asReal Rf_eval Rf_findVar Rf_getAttrib Rf_install Rf_isEnvironment Rf_isFunction Rf_isNewList Rf_isNumeric Rf_isReal Rf_isString Rf_lang1 Rf_lang2 Rf_protect Rf_setAttrib Rf_unprotect LENGTH R_CHAR STRING_ELT VECTOR_ELT SET_VECTOR_ELT REAL R_registerRoutines mkdir -p -- ../../../../library/nls/libs gmake[5]: Leaving directory `/soft/R/R-1.5.1/src/library/nls/src' gmake[4]: Leaving directory `/soft/R/R-1.5.1/src/library/nls/src...