Stan Math Library  2.15.0
reverse mode automatic differentiation
check_simplex.hpp
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1 #ifndef STAN_MATH_PRIM_MAT_ERR_CHECK_SIMPLEX_HPP
2 #define STAN_MATH_PRIM_MAT_ERR_CHECK_SIMPLEX_HPP
3 
10 #include <sstream>
11 #include <string>
12 
13 namespace stan {
14  namespace math {
15 
38  template <typename T_prob>
39  void check_simplex(const char* function,
40  const char* name,
41  const Eigen::Matrix<T_prob, Eigen::Dynamic, 1>& theta) {
42  using Eigen::Dynamic;
43  using Eigen::Matrix;
44 
45  typedef typename index_type<Matrix<T_prob, Dynamic, 1> >::type size_t;
46 
47  check_nonzero_size(function, name, theta);
48  if (!(fabs(1.0 - theta.sum()) <= CONSTRAINT_TOLERANCE)) {
49  std::stringstream msg;
50  T_prob sum = theta.sum();
51  msg << "is not a valid simplex.";
52  msg.precision(10);
53  msg << " sum(" << name << ") = " << sum
54  << ", but should be ";
55  std::string msg_str(msg.str());
56  domain_error(function, name, 1.0,
57  msg_str.c_str());
58  }
59  for (size_t n = 0; n < theta.size(); n++) {
60  if (!(theta[n] >= 0)) {
61  std::ostringstream msg;
62  msg << "is not a valid simplex. "
63  << name << "[" << n + stan::error_index::value << "]"
64  << " = ";
65  std::string msg_str(msg.str());
66  domain_error(function, name, theta[n],
67  msg_str.c_str(),
68  ", but should be greater than or equal to 0");
69  }
70  }
71  }
72  }
73 }
74 #endif
fvar< T > sum(const std::vector< fvar< T > > &m)
Return the sum of the entries of the specified standard vector.
Definition: sum.hpp:20
void check_simplex(const char *function, const char *name, const Eigen::Matrix< T_prob, Eigen::Dynamic, 1 > &theta)
Check if the specified vector is simplex.
void check_nonzero_size(const char *function, const char *name, const T_y &y)
Check if the specified matrix/vector is of non-zero size.
fvar< T > fabs(const fvar< T > &x)
Definition: fabs.hpp:15
const double CONSTRAINT_TOLERANCE
The tolerance for checking arithmetic bounds In rank and in simplexes.
Primary template class for the metaprogram to compute the index type of a container.
Definition: index_type.hpp:18
void domain_error(const char *function, const char *name, const T &y, const char *msg1, const char *msg2)
Throw a domain error with a consistently formatted message.

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