Solved

Find minimum and maximum value for two dimensional array

Posted on 2010-11-10
10
3,454 Views
Last Modified: 2012-05-10
Hi, I have been beating my head against the wall trying to figure this out.  I am trying to figure out the minimum and maximum value for a single row.  I have added the values from three rows of a two dimensional array into a fourth row and I want to get the minimum and maximum value from the row but I can't seem to figure it out.  The code below gives me weird results.  I set my min and max at [3][0] because I only want to scan row 3.  Thanks for the help.

int min = sales[3][0];

      for (int row = 3; row < sales.length; row++)
            {
                  for (int column = 0; column < grades.length; column++)
                  {
                        if (sales[row][column] < min)
                        min = sales[row][column];
                  }
            }

      //Maximum
      int max = grades[3][0];

      for (int row = 0; row < sales.length; row++)
      {
            for (int column = 0; column < sales.length; column++)
            {
                  if (sales[row][column] > max)
                  max = sales[row][column];
            }
      }
0
Comment
Question by:dhatlas
10 Comments
 
LVL 32

Expert Comment

by:phoffric
ID: 34106779
>>    for (int row = 3; row < sales.length; row++)>>            {>>                  for (int column = 0; column < grades.length; column++)Why are you mixing sales and grades matrices in this double for loop?
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 34107200
[3][0] would essentially  give you an empty matrix
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 34107258
Addressing the matrix is done theoretically as

m[row][col]

so row iteration is done using the first dimension. To give you at least one element (column) in the row, see that col >= 1 when the matrix is created
0
Active Directory Webinar

We all know we need to protect and secure our privileges, but where to start? Join Experts Exchange and ManageEngine on Tuesday, April 11, 2017 10:00 AM PDT to learn how to track and secure privileged users in Active Directory.

 
LVL 16

Expert Comment

by:HooKooDooKu
ID: 34107307
Based on the question title, I would assume you need the min and max values for the individual elements in the whole array.  If so, then why two seperate loops for min and max, and why the extra dimension?

int min = sales[0][0];
int max = sales[0][0];
for( row = 0; row < ROW_COUNT; row++ )
  for( col = 0; col < COLUMN_COUNT; col++)
    if( sales[row][col] < min )
      min = sales[row][col]
    if( sales[row][col] > max )
      max = sales[row][col]
0
 

Author Comment

by:dhatlas
ID: 34107607
I would have an array like this for example:

0 {1,2,3,4,5,6,7,8,9,10}
1 {1,2,3,4,5,6,7,8,9,10}
2 {1,2,3,4,5,6,7,8,9,10}
3 {3,6,9,12,15,18,21,24,27,30) Totals row

I want to get the minimum and the maximum value from the total sales in row 3.  I don't care about searching the values in rows 0 - 2.
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 125 total points
ID: 34107670
You can do something like
    public static int[] getMinMax(int[] a) {
	int max = Integer.MIN_VALUE;
	int min = Integer.MAX_VALUE;
	for(int i = 0;i < a.length;i++) {	
	    min = Math.min(min, a[i]);
	    max = Math.max(max, a[i]);
	}
	return new int[] { min, max };
    }

Open in new window

0
 

Author Comment

by:dhatlas
ID: 34107768
Interesting, so how would I call that method?  I mean to display the results:
For example:

System.out.println("Lowest total sales for the month are  " + method call?)
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 34107778
System.out.println("Lowest total sales for the month are  " + getMinMax(array)[0]);
0
 

Author Comment

by:dhatlas
ID: 34107878
Great.  Thanks.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 34110231
:)
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Okay. So what exactly is the problem here? How often have we come across situations where we need to know if two strings are 'similar' but not necessarily the same? I have, plenty of times. Until recently, I thought any functionality like that wo…
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

830 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question