Find Maximum Number Index In 2D Array

Question

So I'm trying to come up with this method that will display the index of the maximum number in the 2D array. I was able to do it for a single D array, but I'm having trouble doing it for the 2D.

public static int findMaximumValue(int[ ][ ] a)
{
   int maxVal = a [0][0];
   int i = 0;

   for(i = 0; i < a.length; i++)
   {
      for(int j = 0; j < a[0].length; j++)
      {
         if(a[i][j] > maxVal)
         {
            maxVal = a[i][j];
         }
      }
   }
   return(maxVal);
 }

2D ARRAY

public static int [][] findMaximumIndex(int[ ][ ] a)
{
   int maxVal = a[0][0];
   int [][] maxIndex = new int [1][2];
   int row = 0, col = 0; 

   for(row = 0; row < a.length; row++)
   {
      for(col = 0; col < a[row].length; col++)
      {
         if(a[row][col] > maxVal)
         {
           maxVal = a[row][col];
           maxIndex [1] [2] = a[row][col];
         }
      }
   }
   return(maxIndex); 
}

in 2d array you return one element but your return type is integer 2d array — amila isura
– amila isura, Commented Jul 22, 2015 at 4:15
maxVal = a[row][col]; maxIndex [1] [2] = a[row][col]; you doing same thing in two steps you assign maxvalue — amila isura
– amila isura, Commented Jul 22, 2015 at 4:25

GregH · Accepted Answer · 2015-07-22 01:00:16Z

1

First, you are returning a 2d int array when you want to return the index of the maxValue which will be a row index and a column index. Perhaps you want to return an array of size 2 to represent this? more info would be helpful. Second, I'm not sure what your doing with the maxIndex 2d array. Each time you iterate through the 2d array, just comepare the maxvalue to the current element. havent got an IDE near to debug but should go something like this:

  public static int[] findMaximumIndex(int[ ][ ] a)
{
    int maxVal = -99999
    int[] answerArray = new int[2];
    for(int row = 0; row < a.length; row++)
    {
        for(int col = 0; col < a[row].length; col++)
        {
            if(a[row][col] > maxVal)
            {
                maxVal = a[row][col];
                answerArray[0] = row;
                answerArray[1] = col;
            }
        }
    }
    return answerArray;
}

here answerArray[0] will have the row index for the max element and answerArray[1] will have the column index for the max element

edited Jul 22, 2015 at 1:00

answered Jul 22, 2015 at 0:33

GregH

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6 Comments

Edward Lavaire Over a year ago

That will give me the maximum value, but I'am trying to output the index of the maximum value in the 2D array.

GregH Over a year ago

sorry for the misunderstanding, there will be two indexes since you have rows and columns. so do you want to print out the row and col? or you can throw them in an array of size 2 you can return but that would be very strange

Edward Lavaire Over a year ago

Thats what I'am trying to do, I want to return it rather than print out. I'm just not sure how to do it exactly.

GregH Over a year ago

answer updated again. Is this what youre looking for?

deezy Over a year ago

I don't think maxVal would be necessary.

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