| Stan Math Library 2.6.3 probability, sampling & optimization

- Main Page
- Namespaces
- Classes
- Files

- File List
- File Members

All Classes Namespaces Files Functions Variables Typedefs Enumerator Friends Macros
trunc.hpp
Go to the documentation of this file.
1 #ifndef STAN_MATH_REV_SCAL_FUN_TRUNC_HPP
2 #define STAN_MATH_REV_SCAL_FUN_TRUNC_HPP
3
4 #include <math.h>
5 #include <stan/math/rev/core.hpp>
6 #include <boost/math/special_functions/fpclassify.hpp>
7 #include <limits>
8
9 namespace stan {
10 namespace math {
11
12 namespace {
13 class trunc_vari : public op_v_vari {
14 public:
15 explicit trunc_vari(vari* avi) :
16 op_v_vari(::trunc(avi->val_), avi) {
17 }
18 void chain() {
19 if (unlikely(boost::math::isnan(avi_->val_)))
20 avi_->adj_ = std::numeric_limits<double>::quiet_NaN();
21 }
22 };
23 }
24
55 inline var trunc(const var& a) {
56 return var(new trunc_vari(a.vi_));
57 }
58
59 }
60 }
61 #endif
core.hpp
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
stan::math::trunc
fvar< T > trunc(const fvar< T > &x)
Definition: trunc.hpp:12
boost::math::isnan
bool isnan(const stan::math::var &v)
Checks if the given number is NaN.
Definition: boost_isnan.hpp:22
unlikely
#define unlikely(x)
Definition: likely.hpp:9
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44

[ Stan Home Page ] © 2011–2015, Stan Development Team.