Hi,
I'd like to construct an R list object in C++, fill it with relevant data, and
pass it to an R function which will return a different list object back. I
have browsed through all the R manuals, and examples under tests/Embedding, but
can't figure out the correct way. Below is my code snippet:
#include <Rinternals.h>
// Rf_initEmbeddedR and other setups already performed
SEXP arg, ret;
// this actually creates a pairlist. I can't find any API that creates a
list
PROTECT(arg = allocList(3));
// I want the first element to be type integer, second double, and third a
vector.
INTEGER(arg)[0] = 1; // <- runtime exception: "INTEGER() can
only be applied to a 'integer', not a 'pairlist'
REAL(arg)[1] = 2.5; // control never reached here
VECTOR_PTR(arg)[2] = allocVector(REALSXP, 4);
REAL(VECTOR_PTR(arg)[2])[0] = 10.0;
REAL(VECTOR_PTR(arg)[2])[1] = 11.0;
REAL(VECTOR_PTR(arg)[2])[2] = 12.0;
REAL(VECTOR_PTR(arg)[2])[3] = 13.0;
PROTECT(call = lang2(install(entryPoint.c_str()), arg));
ret = R_tryEval(call, R_GlobalEnv, &errorOccurred);
I'll be grateful if you can point me to any online docs/samples.
Thanks in advance,
Wayne
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