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Thread: How do I find the mode in a list when values of similar frequencies mean that there is no mode?

  1. #1
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    Default How do I find the mode in a list when values of similar frequencies mean that there is no mode?

    My logic in this program was to compare values and store the values with the highest frequencies using maxFreq. If I have two of the same highest frequencies, then the computer should display "No mode", but I got very confused after a while because I might have several modes and I think that I might even have to use extra loops to loop through the frequencies of values to compare the frequencies of the modes.

      public static void printStatistics(ArrayList<Integer> list) {
        double sum = 0;
        double maxFreq = 0;
        int freq = 1;
        for (int i = 0; i < list.size(); i++) {
          sum += list.get(i);
          for (int j = i + 1; j < list.size(); j++) {
            //compare the max freq and freq count
            if (list.get(i) == list.get(j)) {
             freq++;
              if (maxFreq < freq) {
                maxFreq = freq;
                freq = 1;
            } else {
              freq = 1;
            }
          }
        }
      }
    }

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: How do I find the mode in a list when values of similar frequencies mean that there is no mode?

    What questions do you have about java programming?
    You text talks about some algorithm that you have tried to write code for.
    What problem are you trying to solve? What is wrong with the program's output? What should the output be?

    Do you have the algorithm for solving that problem? If so please post it so its logic can be compared to the posted code.

    Why is the method named: printStatistics? I don't see any print statements.
    Why are the local variable double instead of int?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: How do I find the mode in a list when values of similar frequencies mean that there is no mode?

    I have questions on sorting algorithms, traversing 2d arrays to print the sums, moving elements around, and understanding the super keyword/is a-has a relationship/class casting. These areas are making me struggle since I don't understand why my code doesn't work in certain situations.

    The assignment requires me to find the sum, average, and mode of a list of integers passed into the array. I can find the average and sum, but not the mode. My code doesn't work when there are two values with the same frequency e.g. 1, 1, 3, 3, 5, 5 (my code would print 5 instead of "There is no mode").

    Here's my full code:

    public static void printStatistics(ArrayList<Integer> list) {
        int sum = 0;
        int maxFreq = 0;
        int freq = 1;
        boolean noSimilarMode = true;
        ArrayList<Integer> l1 = new ArrayList<Integer>();
        for (int i = 0; i < list.size(); i++) {
          sum += list.get(i);
     
          for (int j = 0; j < list.size(); j++) {
            //compare the max freq and freq count
            if (j == i) {
              continue;
            }
            if (list.get(i) == list.get(j)) {
              freq++;
              if (j < list.size() - 1 && maxFreq < freq && (list.get(j + 1) != list.get(j))) {
                maxFreq = list.get(j);
                l1.add(freq);
                freq = 1;
              }
            } else {
              freq = 1;
            }
              if (maxFreq < freq) {
                maxFreq = list.get(j);
                freq = 1;
              } else {
                freq = 1;
              }
          }
        }
     
        for (int a = 0; a < l1.size(); a++) {
          for (int b = 0; b < l1.size(); b++) {
            if (l1.size() > 1 && (a == b)) {
              continue;
            } else {
              if (l1.get(a) == l1.get(b)) {
                noSimilarMode = false;
                break;
              }
            }
          }
        }
     
        double avg = 1.0 * sum/(list.size()); //avg
        System.out.println();
          // prints
        if (maxFreq > 1 && freq == 1 && noSimilarMode) {
          System.out.println("Sum: " + sum);
          System.out.println("Average: " + avg);
          System.out.println("Mode: " + maxFreq);
        } 
        }*/ else if (noSimilarMode == false || freq == 1) {
          System.out.println("Sum: " + sum);
          System.out.println("Average: " + avg);
          System.out.println("Mode: no single mode");
        }
      }
    }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: How do I find the mode in a list when values of similar frequencies mean that there is no mode?

    The posted code does not compile. Please fix the compiler errors.

    How are you trying to debug the code to see what is wrong?
    If you don't understand my answer, don't ignore it, ask a question.

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