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

[Xiao He]

Thanks. This solves the problem! 

Sent from my iPhone

On Jul 5, 2013, at 9:47 AM, Simon Zehnder <szehnder at uni-bonn.de> wrote:

> 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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