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Thread: How come the mean is 7?

  1. #1
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    Default How come the mean is 7?

    How do I calculate the mean?
    The answer for this case is 7.
    Why?

    My assignment is here(if you want to know the question but I don't think you need it to answer "my" question):
    http://www.cse.yorku.ca/course/2011/...201/Q2/Q2.html

    The following is the tester class:



     
    /**
     * Tests the IntegralImage class.
     */
    public class testIntegralImage {
     
    	public static void main(String[] args) {
    		int[][] image1 = {{1, 2, 3},
    				       {4, 5, 6}, 
    				       {7, 8, 9}};  // a 2d array. three rows, three columns.
    		int top,bottom,left,right;
    		double mean;
     
    		IntegralImage integralImage1;
    		top = 1;
    		bottom = 2;
    		left = 1;
    		right = 2;
     
    		try {
    			integralImage1 = new IntegralImage(image1);
    		} catch (InvalidImageException iix) {
    			System.out.println("Invalid Image Exception");
    			return;
    		}
    		try {
    			mean = integralImage1.meanSubImage(top,bottom,left,right);      //should be 7.0
    			System.out.println("The mean of the subimage from ("+top+","+left+") to ("+bottom+","+right+") is "+mean);
    		} catch (InvalidSubImageIndexException isiix) 
    		{
    			System.out.println("Invalid SubImage Index Exception");
    		}
     
    	}
    }

    I'm having trouble understanding the question. I think you have to look at the 2d array and calculate the mean, given the top, left, bottom and right. How do you get 7 from this?
    Last edited by IAmHere; January 23rd, 2012 at 12:32 AM.

  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: How come the mean is 7?

    Quote Originally Posted by IAmHere View Post
    I'm having trouble understanding the question. I think you have to look at the 2d array and calculate the mean, given the top, left, bottom and right. How do you get 7 from this?
    The program description explains pretty clearly how to calculate the mean, and 7 is the correct answer in this case. What do you think the answer should be?
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