Stan Math Library  2.11.0
reverse mode automatic differentiation
lb_free.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_FUN_LB_FREE_HPP
2 #define STAN_MATH_PRIM_SCAL_FUN_LB_FREE_HPP
3 
6 #include <boost/math/tools/promotion.hpp>
7 #include <cmath>
8 #include <limits>
9 
10 namespace stan {
11 
12  namespace math {
13 
29  template <typename T, typename TL>
30  inline
31  typename boost::math::tools::promote_args<T, TL>::type
32  lb_free(const T y, const TL lb) {
33  using std::log;
34  if (lb == -std::numeric_limits<double>::infinity())
35  return identity_free(y);
36  stan::math::check_greater_or_equal("stan::math::lb_free",
37  "Lower bounded variable", y, lb);
38  return log(y - lb);
39  }
40 
41  }
42 
43 }
44 
45 #endif
bool check_greater_or_equal(const char *function, const char *name, const T_y &y, const T_low &low)
Return true if y is greater or equal than low.
fvar< T > log(const fvar< T > &x)
Definition: log.hpp:15
T identity_free(const T y)
Returns the result of applying the inverse of the identity constraint transform to the input...
boost::math::tools::promote_args< T, TL >::type lb_free(const T y, const TL lb)
Return the unconstrained value that produces the specified lower-bound constrained value...
Definition: lb_free.hpp:32

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