34     puts(
"***************** Distance-based system example *****************");
 
   35     matrix_t ref_pos_matrix[4][3] = { { 0, 0, 1.67 },       
 
   41     matrix_t true_pos[3] = { 1.0000, 3.0000, 0.0000 }; 
 
   43     matrix_t measured_dist_arr[4] = { 3.577157155, 4.685985423, 3.883094303,
 
   47     uint8_t ref_point_num = 4;
 
   51     printf(
"true position = ");
 
   55     printf(
"estimated position = ");