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block.hpp
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1 #ifndef STAN_MATH_PRIM_MAT_FUN_BLOCK_HPP
2 #define STAN_MATH_PRIM_MAT_FUN_BLOCK_HPP
3
4 #include <stan/math/prim/mat/fun/Eigen.hpp>
5 #include <stan/math/prim/mat/err/check_row_index.hpp>
6 #include <stan/math/prim/mat/err/check_column_index.hpp>
7
8 namespace stan {
9 namespace math {
10
20 template <typename T>
21 inline
22 Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic>
23 block(const Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic>& m,
24 size_t i, size_t j, size_t nrows, size_t ncols) {
25 using stan::math::check_row_index;
26 using stan::math::check_column_index;
27
28 check_row_index("block", "i", m, i);
29 check_row_index("block", "i+nrows-1", m, i+nrows-1);
30 check_column_index("block", "j", m, j);
31 check_column_index("block", "j+ncols-1", m, j+ncols-1);
32 return m.block(i - 1, j - 1, nrows, ncols);
33 }
34
35 }
36 }
37 #endif
check_column_index.hpp
stan::math::check_row_index
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.
Definition: check_row_index.hpp:32
check_row_index.hpp
Eigen.hpp
stan::math::check_column_index
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.
Definition: check_column_index.hpp:37
stan::math::block
Eigen::Matrix< T, Eigen::Dynamic, Eigen::Dynamic > block(const Eigen::Matrix< T, Eigen::Dynamic, Eigen::Dynamic > &m, size_t i, size_t j, size_t nrows, size_t ncols)
Return a nrows x ncols submatrix starting at (i-1, j-1).
Definition: block.hpp:23

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