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log1m.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_LOG1M_HPP
2 #define STAN_MATH_REV_SCAL_FUN_LOG1M_HPP
3
4 #include <stan/math/rev/core.hpp>
5 #include <stan/math/prim/scal/fun/log1p.hpp>
6
7 namespace stan {
8 namespace math {
9
10 namespace {
11 class log1m_vari : public op_v_vari {
12 public:
13 explicit log1m_vari(vari* avi) :
14 op_v_vari(stan::math::log1p(-avi->val_), avi) {
15 }
16 void chain() {
17 avi_->adj_ += adj_ / (avi_->val_ - 1);
18 }
19 };
20 }
21
32 inline var log1m(const stan::math::var& a) {
33 return var(new log1m_vari(a.vi_));
34 }
35
36 }
37 }
38 #endif
core.hpp
stan
Definition: log_sum_exp.hpp:8
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:31
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:43
stan::math::log1p
fvar< T > log1p(const fvar< T > &x)
Definition: log1p.hpp:16
log1p.hpp
stan::math::log1m
fvar< T > log1m(const fvar< T > &x)
Definition: log1m.hpp:16

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