1 #ifndef STAN_MATH_PRIM_SCAL_PROB_POISSON_LOG_HPP
2 #define STAN_MATH_PRIM_SCAL_PROB_POISSON_LOG_HPP
18 #include <boost/random/poisson_distribution.hpp>
19 #include <boost/random/variate_generator.hpp>
26 template <
bool propto,
typename T_n,
typename T_rate>
27 typename return_type<T_rate>::type
32 static const char*
function(
"poisson_log");
40 T_partials_return logp(0.0);
47 "Rate parameter", lambda);
56 for (
size_t i = 0; i <
size; i++)
59 for (
size_t i = 0; i <
size; i++)
60 if (lambda_vec[i] == 0 && n_vec[i] != 0)
65 for (
size_t i = 0; i <
size; i++) {
66 if (!(lambda_vec[i] == 0 && n_vec[i] == 0)) {
68 logp -=
lgamma(n_vec[i] + 1.0);
75 operands_and_partials.
d_x1[i]
76 += n_vec[i] /
value_of(lambda_vec[i]) - 1.0;
78 return operands_and_partials.
value(logp);
81 template <
typename T_n,
86 return poisson_log<false>(n, lambda);
fvar< T > lgamma(const fvar< T > &x)
bool check_not_nan(const char *function, const char *name, const T_y &y)
Return true if y is not NaN.
T value_of(const fvar< T > &v)
Return the value of the specified variable.
T_return_type value(double value)
Returns a T_return_type with the value specified with the partial derivatves.
size_t length(const std::vector< T > &x)
Template metaprogram to calculate whether a summand needs to be included in a proportional (log) prob...
boost::math::tools::promote_args< typename scalar_type< T1 >::type, typename scalar_type< T2 >::type, typename scalar_type< T3 >::type, typename scalar_type< T4 >::type, typename scalar_type< T5 >::type, typename scalar_type< T6 >::type >::type type
Metaprogram to determine if a type has a base scalar type that can be assigned to type double...
This class builds partial derivatives with respect to a set of operands.
return_type< T_rate >::type poisson_log(const T_n &n, const T_rate &lambda)
size_t max_size(const T1 &x1, const T2 &x2)
int is_inf(const fvar< T > &x)
Returns 1 if the input's value is infinite and 0 otherwise.
fvar< T > multiply_log(const fvar< T > &x1, const fvar< T > &x2)
int size(const std::vector< T > &x)
Return the size of the specified standard vector.
bool check_consistent_sizes(const char *function, const char *name1, const T1 &x1, const char *name2, const T2 &x2)
Return true if the dimension of x1 is consistent with x2.
bool check_nonnegative(const char *function, const char *name, const T_y &y)
Return true if y is non-negative.
VectorView is a template expression that is constructed with a container or scalar, which it then allows to be used as an array using operator[].
boost::math::tools::promote_args< typename partials_type< typename scalar_type< T1 >::type >::type, typename partials_type< typename scalar_type< T2 >::type >::type, typename partials_type< typename scalar_type< T3 >::type >::type, typename partials_type< typename scalar_type< T4 >::type >::type, typename partials_type< typename scalar_type< T5 >::type >::type, typename partials_type< typename scalar_type< T6 >::type >::type >::type type
VectorView< T_return_type, false, true > d_x1