| Stan Math Library 2.12.0 reverse mode automatic differentiation

- Main Page
- Modules
- Namespaces
- Classes
- Files

- File List
- File Members

lb_constrain.hpp
Go to the documentation of this file.
1 #ifndef STAN_MATH_PRIM_SCAL_FUN_LB_CONSTRAIN_HPP
2 #define STAN_MATH_PRIM_SCAL_FUN_LB_CONSTRAIN_HPP
3
4 #include <boost/math/tools/promotion.hpp>
5 #include <stan/math/prim/scal/fun/identity_constrain.hpp>
6 #include <cmath>
7 #include <limits>
8
9 namespace stan {
10 namespace math {
11
31 template <typename T, typename TL>
32 inline
33 T lb_constrain(const T x, const TL lb) {
34 using std::exp;
35 if (lb == -std::numeric_limits<double>::infinity())
36 return identity_constrain(x);
37 return exp(x) + lb;
38 }
39
56 template <typename T, typename TL>
57 inline
58 typename boost::math::tools::promote_args<T, TL>::type
59 lb_constrain(const T x, const TL lb, T& lp) {
60 using std::exp;
61 if (lb == -std::numeric_limits<double>::infinity())
62 return identity_constrain(x, lp);
63 lp += x;
64 return exp(x) + lb;
65 }
66
67 }
68
69 }
70
71 #endif
stan
Definition: log_sum_exp.hpp:8
stan::math::lb_constrain
T lb_constrain(const T x, const TL lb)
Return the lower-bounded value for the specified unconstrained input and specified lower bound...
Definition: lb_constrain.hpp:33
stan::math::exp
fvar< T > exp(const fvar< T > &x)
Definition: exp.hpp:10
identity_constrain.hpp
stan::math::identity_constrain
T identity_constrain(T x)
Returns the result of applying the identity constraint transform to the input.
Definition: identity_constrain.hpp:21

[ Stan Home Page ] © 2011–2016, Stan Development Team.