- I rewrite the for loop. It will start from 0
 - The software run sucessfully in the machine
 - However, the result is not correct. The value are too large
 - Then, I rewrite the loop to let the program output peak-peak value. Ma checks the value and tells me all of them are correct
 - Then I find I just add all of the values but forget to divid the groups
 - After modifying, the program could output the normal value