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ordered_free.hpp
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1 #ifndef STAN_MATH_PRIM_MAT_FUN_ORDERED_FREE_HPP
2 #define STAN_MATH_PRIM_MAT_FUN_ORDERED_FREE_HPP
3
4 #include <stan/math/prim/mat/fun/Eigen.hpp>
5 #include <stan/math/prim/mat/err/check_ordered.hpp>
6 #include <stan/math/prim/mat/meta/index_type.hpp>
7 #include <cmath>
8
9 namespace stan {
10 namespace math {
24 template <typename T>
25 Eigen::Matrix<T, Eigen::Dynamic, 1>
26 ordered_free(const Eigen::Matrix<T, Eigen::Dynamic, 1>& y) {
27 stan::math::check_ordered("stan::math::ordered_free",
28 "Ordered variable", y);
29 using Eigen::Matrix;
30 using Eigen::Dynamic;
31 using stan::math::index_type;
32 using std::log;
33 typedef typename index_type<Matrix<T, Dynamic, 1> >::type size_type;
34
35 size_type k = y.size();
36 Matrix<T, Dynamic, 1> x(k);
37 if (k == 0)
38 return x;
39 x[0] = y[0];
40 for (size_type i = 1; i < k; ++i)
41 x[i] = log(y[i] - y[i-1]);
42 return x;
43 }
44 }
45 }
46 #endif
stan::math::ordered_free
Eigen::Matrix< T, Eigen::Dynamic, 1 > ordered_free(const Eigen::Matrix< T, Eigen::Dynamic, 1 > &y)
Return the vector of unconstrained scalars that transform to the specified positive ordered vector...
Definition: ordered_free.hpp:26
stan
Definition: log_sum_exp.hpp:8
stan::math::log
fvar< T > log(const fvar< T > &x)
Definition: log.hpp:15
check_ordered.hpp
stan::math::size_type
Eigen::Matrix< double, Eigen::Dynamic, Eigen::Dynamic >::Index size_type
Type for sizes and indexes in an Eigen matrix with double e.
Definition: typedefs.hpp:13
stan::math::index_type
Primary template class for the metaprogram to compute the index type of a container.
Definition: index_type.hpp:19
stan::math::check_ordered
bool check_ordered(const char *function, const char *name, const std::vector< T_y > &y)
Return true if the specified vector is sorted into strictly increasing order.
Definition: check_ordered.hpp:30
index_type.hpp
Eigen.hpp

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