Stan Math Library  2.9.0
reverse mode automatic differentiation
sub_row.hpp
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1 #ifndef STAN_MATH_PRIM_MAT_FUN_SUB_ROW_HPP
2 #define STAN_MATH_PRIM_MAT_FUN_SUB_ROW_HPP
3 
7 
8 namespace stan {
9 
10  namespace math {
11 
20  template <typename T>
21  inline
22  Eigen::Matrix<T, 1, Eigen::Dynamic>
23  sub_row(const Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic>& m,
24  size_t i, size_t j, size_t ncols) {
25  stan::math::check_row_index("sub_row", "i", m, i);
26  stan::math::check_column_index("sub_row", "j", m, j);
27  if (ncols > 0)
28  stan::math::check_column_index("sub_col", "j+ncols-1", m, j+ncols-1);
29  return m.block(i - 1, j - 1, 1, ncols);
30  }
31 
32  }
33 }
34 
35 #endif
Eigen::Matrix< T, 1, Eigen::Dynamic > sub_row(const Eigen::Matrix< T, Eigen::Dynamic, Eigen::Dynamic > &m, size_t i, size_t j, size_t ncols)
Return a 1 x nrows subrow starting at (i-1, j-1).
Definition: sub_row.hpp:23
bool check_row_index(const char *function, const char *name, const Eigen::Matrix< T_y, R, C > &y, size_t i)
Return true if the specified index is a valid row of the matrix.
bool check_column_index(const char *function, const char *name, const Eigen::Matrix< T_y, R, C > &y, const size_t i)
Return true if the specified index is a valid column of the matrix.

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