[Rcpp-devel] Error when calling `qchisq()`.

[Simon Zehnder]

Hi Xiao,

I assume, that you have to use the function with its namespace R::qchisq(). The 'using namespace Rcpp;' command does not include the namespace R in which the function qchisq is defined. 

Best

Simon


On Jul 5, 2013, at 6:22 PM, Xiao He <praguewatermelon at gmail.com> wrote:

> Hi,
> 
> I tried to call qchisq() (see mock code below). But while compiling it, I got an error message saying ` error: no matching function for call to ‘qchisq(double, double, int, int)’`. I checked this file: http://dirk.eddelbuettel.com/code/rcpp/html/Rmath_8h_source.html, and saw this: " double qchisq(double p, double df, int lt, int lg)" . The four arguments in the mock code also follow the double, double, int, int form. So I wonder what the problem is with my way of specifying the code. Thanks.
> 
> 
> #include <R.h>
> #include <stdio.h>
> #include <RcppArmadillo.h>
> // [[Rcpp::depends(RcppArmadillo)]]
> 
> using namespace Rcpp;
> using namespace arma;
> 
> RcppExport SEXP foo(SEXP X){
> 	NumericVector x(X);
> 	double output = qchisq(0.5, (double)x(0), 1, 0);
> 	return(wrap(output));
> }
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