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fmin.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_FMIN_HPP
2 #define STAN_MATH_REV_SCAL_FUN_FMIN_HPP
3
4 #include <stan/math/rev/core.hpp>
5 #include <boost/math/special_functions/fpclassify.hpp>
6 #include <stan/math/prim/scal/fun/constants.hpp>
7 #include <stan/math/prim/scal/meta/likely.hpp>
8 #include <stan/math/rev/scal/fun/is_nan.hpp>
9 #include <stan/math/prim/scal/fun/is_nan.hpp>
10
11 namespace stan {
12
13 namespace math {
14
59 inline var fmin(const stan::math::var& a,
60 const stan::math::var& b) {
61 using stan::math::NOT_A_NUMBER;
62 if (unlikely(is_nan(a))) {
63 if (unlikely(is_nan(b)))
64 return var(new precomp_vv_vari(NOT_A_NUMBER,
65 a.vi_, b.vi_,
66 NOT_A_NUMBER, NOT_A_NUMBER));
67 return b;
68 }
69
70 if (unlikely(is_nan(b)))
71 return a;
72
73 return a < b ? a : b;
74 }
75
89 inline var fmin(const stan::math::var& a,
90 double b) {
91 using stan::math::NOT_A_NUMBER;
92 if (unlikely(is_nan(a))) {
93 if (unlikely(is_nan(b)))
94 return var(new precomp_v_vari(NOT_A_NUMBER,
95 a.vi_,
96 NOT_A_NUMBER));
97 return var(b);
98 }
99
100 if (unlikely(is_nan(b)))
101 return a;
102
103 return a <= b ? a : var(b);
104 }
105
120 inline var fmin(double a,
121 const stan::math::var& b) {
122 using stan::math::NOT_A_NUMBER;
123 if (unlikely(is_nan(b))) {
124 if (unlikely(is_nan(a)))
125 return var(new precomp_v_vari(NOT_A_NUMBER,
126 b.vi_,
127 NOT_A_NUMBER));
128
129 return var(a);
130 }
131
132 if (unlikely(is_nan(a)))
133 return b;
134
135 return b <= a ? b : var(a);
136 }
137
138 }
139 }
140 #endif
stan::math::fmin
fvar< T > fmin(const fvar< T > &x1, const fvar< T > &x2)
Definition: fmin.hpp:13
core.hpp
stan::math::NOT_A_NUMBER
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition: constants.hpp:56
is_nan.hpp
stan::math::precomp_vv_vari
Definition: precomp_vv_vari.hpp:11
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
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
likely.hpp
constants.hpp
stan::math::precomp_v_vari
Definition: precomp_v_vari.hpp:11
stan::math::is_nan
int is_nan(const fvar< T > &x)
Returns 1 if the input's value is NaN and 0 otherwise.
Definition: is_nan.hpp:22
is_nan.hpp

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