1 #ifndef STAN_MATH_PRIM_SCAL_PROB_POISSON_LPMF_HPP 2 #define STAN_MATH_PRIM_SCAL_PROB_POISSON_LPMF_HPP 20 template <
bool propto,
typename T_n,
typename T_rate>
22 const T_rate& lambda) {
26 static const char*
function =
"poisson_lpmf";
31 T_partials_return logp(0.0);
46 for (
size_t i = 0; i <
size; i++)
49 for (
size_t i = 0; i <
size; i++)
50 if (lambda_vec[i] == 0 && n_vec[i] != 0)
55 for (
size_t i = 0; i <
size; i++) {
56 if (!(lambda_vec[i] == 0 && n_vec[i] == 0)) {
58 logp -=
lgamma(n_vec[i] + 1.0);
65 ops_partials.
edge1_.partials_[i]
66 += n_vec[i] /
value_of(lambda_vec[i]) - 1.0;
68 return ops_partials.
build(logp);
71 template <
typename T_n,
typename T_rate>
73 const T_rate& lambda) {
74 return poisson_lpmf<false>(n, lambda);
boost::math::tools::promote_args< double, typename partials_type< typename scalar_type< T >::type >::type, typename partials_return_type< T_pack... >::type >::type type
fvar< T > lgamma(const fvar< T > &x)
Return the natural logarithm of the gamma function applied to the specified argument.
T value_of(const fvar< T > &v)
Return the value of the specified variable.
Extends std::true_type when instantiated with zero or more template parameters, all of which extend t...
scalar_seq_view provides a uniform sequence-like wrapper around either a scalar or a sequence of scal...
This template builds partial derivatives with respect to a set of operands.
bool size_zero(T &x)
Returns 1 if input is of length 0, returns 0 otherwise.
Template metaprogram to calculate whether a summand needs to be included in a proportional (log) prob...
void check_nonnegative(const char *function, const char *name, const T_y &y)
Check if y is non-negative.
boost::math::tools::promote_args< double, typename scalar_type< T >::type, typename return_type< Types_pack... >::type >::type type
void check_not_nan(const char *function, const char *name, const T_y &y)
Check if y is not NaN.
size_t max_size(const T1 &x1, const T2 &x2)
T_return_type build(double value)
Build the node to be stored on the autodiff graph.
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.
void check_consistent_sizes(const char *function, const char *name1, const T1 &x1, const char *name2, const T2 &x2)
Check if the dimension of x1 is consistent with x2.
return_type< T_rate >::type poisson_lpmf(const T_n &n, const T_rate &lambda)
internal::ops_partials_edge< double, Op1 > edge1_