pub unsafe extern "C" fn igraph_eigen_matrix_symmetric(
A: *const igraph_matrix_t,
sA: *const igraph_sparsemat_t,
fun: igraph_arpack_function_t,
n: c_int,
extra: *mut c_void,
algorithm: igraph_eigen_algorithm_t,
which: *const igraph_eigen_which_t,
options: *mut igraph_arpack_options_t,
storage: *mut igraph_arpack_storage_t,
values: *mut igraph_vector_t,
vectors: *mut igraph_matrix_t,
) -> igraph_error_t