XBT_PUBLIC(xbt_matrix_t) xbt_matrix_double_new_id(int lines, int rows);
XBT_PUBLIC(xbt_matrix_t) xbt_matrix_double_new_rand(int lines, int rows);
XBT_PUBLIC(xbt_matrix_t) xbt_matrix_double_new_seq(int lines, int rows);
XBT_PUBLIC(xbt_matrix_t) xbt_matrix_double_new_id(int lines, int rows);
XBT_PUBLIC(xbt_matrix_t) xbt_matrix_double_new_rand(int lines, int rows);
XBT_PUBLIC(xbt_matrix_t) xbt_matrix_double_new_seq(int lines, int rows);