fmax.hpp

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#ifndef STAN_MATH_FWD_FUN_FMAX_HPP
#define STAN_MATH_FWD_FUN_FMAX_HPP
 
#include <stan/math/fwd/meta.hpp>
#include <stan/math/fwd/core.hpp>
#include <stan/math/fwd/fun/is_nan.hpp>
#include <stan/math/prim/fun/constants.hpp>
#include <stan/math/prim/fun/fmax.hpp>
 
namespace stan {
namespace math {
 
template <typename T>
inline fvar<T> fmax(const fvar<T>& x1, const fvar<T>& x2) {
  if (unlikely(is_nan(x1))) {
    if (unlikely(is_nan(x2))) {
      return fvar<T>(NOT_A_NUMBER, NOT_A_NUMBER);
    }
    return x2;
  }
  if (unlikely(is_nan(x2))) {
    return x1;
  }
  return x1 > x2 ? x1 : x2;
}
 
template <typename T>
inline fvar<T> fmax(double x1, const fvar<T>& x2) {
  if (unlikely(is_nan(x1))) {
    if (unlikely(is_nan(x2))) {
      return fvar<T>(NOT_A_NUMBER, NOT_A_NUMBER);
    }
    return x2;
  }
  if (unlikely(is_nan(x2))) {
    return fvar<T>(x1, 0);
  }
  return x1 > x2 ? fvar<T>(x1, 0) : x2;
}
 
template <typename T>
inline fvar<T> fmax(const fvar<T>& x1, double x2) {
  if (unlikely(is_nan(x1))) {
    if (unlikely(is_nan(x2))) {
      return fvar<T>(NOT_A_NUMBER, NOT_A_NUMBER);
    }
    return fvar<T>(x2, 0);
  }
  if (unlikely(is_nan(x2))) {
    return x1;
  }
  return x1 >= x2 ? x1 : fvar<T>(x2, 0);
}
 
}  // namespace math
}  // namespace stan
#endif