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PONot able to update elements in arrayList
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  1. PONot able to update elements in arrayList
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    copied!<p>I have two matrices for feature and weight elements.I am implementing an learning algorithm. I want to update elements of arraylist(vector for representing one sample of feature). Following is the code. But my elements of matrices(vector elements are not) updated. I have put the sample solution too. same value before and after updating is not expected. Could you please let me know where is the flaw in code? </p> <pre><code> for(int i =0 ; i&lt; N ; i++){ //N is a large real number ArrayList&lt;Double&gt; featureVector = new ArrayList&lt;Double&gt;(); featureVector = FeatureMatrix.get(i); System.out.println("Before::"+ featureVector); if(testList.contains(i)){ for(int j=0 ; j&lt; testList.size(); j++){ if(i == testList.get(j)){ int indexInTestList= j; List&lt;Double&gt; subListNextCandidate ; subListNextCandidate = weightVectorNextCandidate.subList((10*indexIntTestList),((10)*(indexInTestList+1))); //clips a portion of member from long list of members List&lt;Double&gt; approxWeight = new ArrayList&lt;Double&gt;(); approxWeight = getApproxWeight(FeatureVector, indexInTestList, FeatureMatrix,WeightMatrix, bias); //approxWeight is a vector of same dimension as of featureVector for(int l=0 ; l&lt; 10;l++){ double Update = featureVector.get(l)+ Rate*((subListCandidate.get(l)-approxWeight.get(l))-(lambda*featureVector.get(l)*(1/M)));//M is large real number featureVector.set(l,Update); } } } } else{ for(int l=0 ; l&lt; 10;l++){ double Update = featureVector.get(l) -Rate*(lambda*featureVector.get(l)*(1/M)); featureVector.set(l, Update); } } System.out.println("After:::"+ FeatureMatrix.get(i) ); } </code></pre> <p>Sample output is::</p> <pre><code> Before::[0.04539928251182193, -0.16233604402485394, 0.905018369795912, -1.2817141994528614, 0.7065420460225843, -0.8946090188977665, -1.74892020689701, -2.1539901172158187, 1.8229765478806985, -1.8109945435256574] After:::[0.04539928251182193, -0.16233604402485394, 0.905018369795912, -1.2817141994528614, 0.7065420460225843, -0.8946090188977665, -1.74892020689701, -2.1539901172158187, 1.8229765478806985, -1.8109945435256574] </code></pre>
 

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