public static extern af_err af_sparse_get_storage(out af_storage output, IntPtr array_in);
public static extern af_err af_sparse_get_info(out IntPtr array_values, out IntPtr array_rowIdx, out IntPtr array_colIdx, out af_storage stype, IntPtr array_in);
public static extern af_err af_create_sparse_array_from_dense(out IntPtr array_out, IntPtr array_dense, af_storage stype);
public static extern af_err af_sparse_convert_to(out IntPtr array_out, IntPtr array_in, af_storage destStorage);
public static extern af_err af_create_sparse_array(out IntPtr array_out, long dim_nRows, long dim_nCols, IntPtr array_values, IntPtr array_rowIdx, IntPtr array_colIdx, af_storage stype);