I’m trying to return the mode of a 2D array using a frequency array. I have an array, score, which is of length 10, and has 3 columns. Each column contains an int that is between 0 and 100.

I’m trying to find a way that will iterate through the array and return the modal value. What I have so far is:

int value = 0; int[] freq = new int[100]; for (int row = 0; row < score.length; row++) { for (int col = 0; col < score[row].length; col++) { score[row][col] = value; freq[value]++; } } int largest = 0; int mode = -1; for (int i = 0; i < 100; i++) { if (freq[i] > largest) { largest = freq[i]; mode = i; } } System.out.println("modal score is: " +mode);

Problem is that this is just returning the modal score as 0, which it isn’t.

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## Answer

You have a problem on generating the `freq`

array. If I understand correctly, on the first double-for block you are trying to put the frequencies of the numbers inside the `freq`

array.

But all you do is:

int value = 0; ..... score[row][col] = value; freq[value]++;`

firstly you are changing the `score`

array,( which is a problem for you I guess…) and the you go to `freq[0]`

and do `++`

. Obviously modal is 0, that number appears in all of the array.

**SOLUTION:** in the first double for block you should do:

value = score[row][col]; freq[value]++;

so I think you mixed up the order of the line, it should be the other way around.