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POArray diagonal neighbourhood analysis and sort
 

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  1. POArray diagonal neighbourhood analysis and sort
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    <p>I've been battling with this for some time and seem to be getting nowhere. The set up is so; I have a 2D array. For this array I need to iterate through each value and return the diagonal neighbours (5 values). These neighbours will be put into a new 1D [5] array and bubblesorted. The middle value (median) will then be returned and put into a new array of medians.</p> <p>So far I have methods for extracting the diagonal neighbours:</p> <pre><code> //get diagonals from original DEM double [] getDiagonals(int i, int j) { double [] tempArray = new double [5]; tempArray[0] = data[i -1][j +1]; tempArray[1] = data[i -1][j -1]; tempArray[2] = data[i][j]; tempArray[3] = data[i +1][j -1]; tempArray[4] = data[i +1][j +1]; return tempArray; } </code></pre> <p>I've then used this method in an iteration to get diagonals for each value in the original array:</p> <pre><code> //get diagonals for each double [] [] bubbles(){ double [] [] datap = new double [298] [298]; for (int i = 1; i &lt; data.length; i++){ for (int j = 1; j &lt; data[i].length; j++) { if ((i &gt; 0) &amp;&amp; (j &gt; 0)) { if ((i &lt; data.length-1) &amp;&amp; (j &lt; data.length-1)){ double [] tempArray = getDiagonals(i, j); //do something with the tempArray </code></pre> <p>I think this is where I'm coming unstuck. Through testing the getDiagonals method works fine. I'm struggling to get the tempArray out of the bubbles() method. If I set the output to be the tempArray it only returns the 5 values calculated for the bottom right corner of the original array. </p> <p>I've tried calling other methods into the bubbles() method in order to do all the processing there and return a new array:</p> <pre><code> //get diagonals for each double [] [] bubbles(){ double [] [] datap = new double [298] [298]; for (int i = 1; i &lt; data.length; i++){ for (int j = 1; j &lt; data[i].length; j++) { if ((i &gt; 0) &amp;&amp; (j &gt; 0)) { if ((i &lt; data.length-1) &amp;&amp; (j &lt; data.length-1)){ double [] tempArray = getDiagonals(i, j); double sorted [] = sort(tempArray); double median = sorted[2]; for (int z = 0; z &lt; datap.length; z++){ for (int y = 0; y &lt; datap[z].length; y++){ datap[z][y] = median; } } } } } } return datap; } </code></pre> <p>Again this fails and the output datap is just zeros. The sort() method above passed out the diagonals to a bubble sort method (which I know works on its </p> <p>I guess my question is how to process within a method that is iterating and populate a new array?</p> <p>I hope this makes sense but if you need more details please let me know. And yes, the sort I'm using is a bubble sort. I know they are rubbish but this is for a course I'm doing so it has to be used. And yes, I'm pretty new to java.</p> <p>Any help would be greatly appreciated (and I'll even reference you if I need to use some code you provide ;) </p>
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    1. USOliver Burdekin
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