api/html/math_2functions_2is__nan_8hpp_source.html

 #ifndef STAN__MATH__FUNCTIONS__IS_NAN_HPP

 #define STAN__MATH__FUNCTIONS__IS_NAN_HPP


 #include <boost/math/special_functions/fpclassify.hpp>


 namespace stan {


   namespace math {


     inline int

     is_nan(const double x) {

       return boost::math::isnan(x);

     }


   }

 }


 #endif

boost::math::isnan
bool isnan(const stan::agrad::var &v)
Checks if the given number is NaN.
Definition: boost_fpclassify.hpp:69

stan::math::is_nan
int is_nan(const double x)
Returns 1 if the input is NaN and 0 otherwise.
Definition: is_nan.hpp:19