1 #ifndef STAN_MATH_PRIM_SCAL_PROB_LOGNORMAL_LCCDF_HPP 2 #define STAN_MATH_PRIM_SCAL_PROB_LOGNORMAL_LCCDF_HPP 17 #include <boost/random/lognormal_distribution.hpp> 18 #include <boost/random/variate_generator.hpp> 24 template <
typename T_y,
typename T_loc,
typename T_scale>
27 static const char*
function(
"lognormal_lccdf");
31 T_partials_return ccdf_log = 0.0;
33 using boost::math::tools::promote_args;
48 operands_and_partials(y, mu, sigma);
59 return operands_and_partials.
value(0.0);
62 const double log_half =
std::log(0.5);
64 for (
size_t n = 0; n < N; n++) {
65 const T_partials_return y_dbl =
value_of(y_vec[n]);
66 const T_partials_return mu_dbl =
value_of(mu_vec[n]);
67 const T_partials_return sigma_dbl =
value_of(sigma_vec[n]);
68 const T_partials_return scaled_diff = (
log(y_dbl) - mu_dbl)
70 const T_partials_return rep_deriv = SQRT_2 / sqrt_pi
71 *
exp(-scaled_diff * scaled_diff) / sigma_dbl;
73 const T_partials_return erfc_calc =
erfc(scaled_diff);
74 ccdf_log += log_half +
log(erfc_calc);
77 operands_and_partials.
d_x1[n] -= rep_deriv / erfc_calc / y_dbl;
79 operands_and_partials.
d_x2[n] += rep_deriv / erfc_calc;
81 operands_and_partials.
d_x3[n] += rep_deriv * scaled_diff * SQRT_2
84 return operands_and_partials.
value(ccdf_log);
VectorView< T_return_type, false, true > d_x2
void check_finite(const char *function, const char *name, const T_y &y)
Check if y is finite.
fvar< T > sqrt(const fvar< T > &x)
return_type< T_y, T_loc, T_scale >::type lognormal_lccdf(const T_y &y, const T_loc &mu, const T_scale &sigma)
T value_of(const fvar< T > &v)
Return the value of the specified variable.
fvar< T > log(const fvar< T > &x)
T_return_type value(double value)
Returns a T_return_type with the value specified with the partial derivatves.
scalar_seq_view provides a uniform sequence-like wrapper around either a scalar or a sequence of scal...
size_t length(const std::vector< T > &x)
void check_nonnegative(const char *function, const char *name, const T_y &y)
Check if y is non-negative.
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...
const double SQRT_2
The value of the square root of 2, .
void check_positive_finite(const char *function, const char *name, const T_y &y)
Check if y is positive and finite.
fvar< T > exp(const fvar< T > &x)
void check_not_nan(const char *function, const char *name, const T_y &y)
Check if y is not NaN.
This class builds partial derivatives with respect to a set of operands.
VectorView< T_return_type, false, true > d_x3
size_t max_size(const T1 &x1, const T2 &x2)
fvar< T > erfc(const fvar< T > &x)
double pi()
Return the value of pi.
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