Rcpp can't find sugar functions

RStudio IDE
1

Hi, I'm using Rcpp inside the Rstudio.
I wish to use a few Sugar package functions, for example, is_infinite(), is_na() and etc.
I believe sugar.h is included in Rcpp.h
However, the Rstudio does not recognize sugar functions.
I wonder if this is because currently Rstudio can not locate sugar.h function, located in somewhere.

Can anybody help resolving this issue please?

Thanks!

2

Any way you can reprex this issue for others?

3

Sorry, I don't understand your reply.
Do you want me to capture my screen?

4

Any way you might turn this into a reproducible example (reprex) of your issue as a starting point? I'm hoping that'll improve your chances of getting a useful reply.

5

Thanks for the suggestion.

For example, when I write a simple test code for infinity check

#include <Rcpp.h>
using namespace Rcpp;

// [[Rcpp::export]]
double testInfinite() {

double x=log(0.0);

Rcout << x;
Rcout << "is infinite\n";
Rcout << is_infinite(x);

return x;
}

I get the error message saying
'no matching function for call to 'is_infinite''
However, is_infinite() is in sugar.h according to the web, and sugar.h included in Rcpp.h

Can anybody have any suggestion on this issue?

Thanks!

6

I just found Rcpp can recognize is_infinite() function only for vector input..
The example is below

#include <Rcpp.h>
using namespace Rcpp;

// [[Rcpp::export]]
double testInfinite() {

NumericVector v =
NumericVector::create( 1, NA_REAL, R_NaN, R_PosInf, R_NegInf);
NumericVector x= NumericVector :: create(log(0.0),1/0.0);

LogicalVector l1 = is_na(v);
LogicalVector l2 = is_nan(v);
LogicalVector l3 = is_infinite(v);
LogicalVector l4 = is_infinite(x);

Rcout << l1 << "\n"; // 0 1 1 0 0
Rcout << l2 << "\n"; // 0 0 1 0 0
Rcout << l3 << "\n"; // 0 0 0 1 1
Rcout << l4 << "\n"; // 1 1

return 0.0;
}

The following page has a good explanation on NaN and Inf in Rcpp