• col_ind : d_real_SpMat
• dd_hi_iter : dd_real_vector_ref
• dd_lo_iter : dd_real_vector_ref
• hi : dd_real_vector
• lo : dd_real_vector
• N : dd_real_vector
• nnz : d_real_SpMat
• row : d_real_SpMat
• row_ptr : d_real_SpMat
• val : d_real_SpMat