Stan Math Library  2.12.0
reverse mode automatic differentiation
log2.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_FUN_LOG2_HPP
2 #define STAN_MATH_PRIM_SCAL_FUN_LOG2_HPP
3 
5 #include <boost/math/tools/promotion.hpp>
6 #include <math.h>
7 #include <stdexcept>
8 
9 namespace stan {
10  namespace math {
11 
23  template <typename T>
24  inline typename boost::math::tools::promote_args<T>::type
25  log2(const T& a) {
26  using std::log;
27  return log(a) / LOG_2;
28  }
29 
38  inline double log2(int x) {
39  return log2(static_cast<double>(x));
40  }
41 
47  inline double log2() {
48  return LOG_2;
49  }
50 
51  }
52 }
53 
54 #endif
const double LOG_2
The natural logarithm of 2, .
Definition: constants.hpp:32
fvar< T > log(const fvar< T > &x)
Definition: log.hpp:14
fvar< T > log2(const fvar< T > &x)
Definition: log2.hpp:14

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