Phi.hpp

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#ifndef __STAN__MATH__FUNCTIONS__PHI_HPP__
#define __STAN__MATH__FUNCTIONS__PHI_HPP__

#include <boost/math/tools/promotion.hpp>
#include <boost/math/special_functions/erf.hpp>
#include <stan/math/constants.hpp>

namespace stan {
  namespace math {

    template <typename T>
    inline typename boost::math::tools::promote_args<T>::type
    Phi(const T x) {
      return 0.5 * (1.0 + boost::math::erf(INV_SQRT_2 * x));
    }

  }
}

#endif