Why do I get the error for using “pnorm” in Rcpp

Question

I need to involve variable from arma::in my Rcpp code. But I ran into a problem when trying to use the sugar function pnorm. Here is a demo:

Answer 1

I'm much less of an expert than @RalfStubner at Rcpp, so I had to hack around (with help from StackOverflow and the Rcpp cheat sheat) to get the following code. Instead of using the R-namespace versions on scalars, I converted back to a NumericVector ... this can almost certainly be done more efficiently/skipping a few steps by someone who actually knows what they're doing ... e.g. it's possible that the arma-to-NumericVector conversion could be done directly without going through as_scalar ... ?

#include 
#include 
#include 

// [[Rcpp::depends(RcppArmadillo)]]
using namespace Rcpp;
using namespace arma;

// [[Rcpp::export]]
NumericVector pget(NumericVector x, NumericVector beta) {
  colvec xx = as(x) ;
  colvec bb = as(beta) ;
  double tt = as_scalar(trans(xx) * bb);
  NumericVector tt2 = NumericVector::create( tt );
  NumericVector temp = Rcpp::pnorm(tt2);
  return temp;
}