loops - out of memory in matlab run time -


i wrote code in matlab r2014a predicting target user rate target item. in method assign weight items computing item similarity between target item , each of corated items between target user , user. after computing items similarities (isim) , catch memory should compute user similarities base on isim. face out of memory error. have 1206 user , 1508 item in dataset. traindata = 1206x1508 isim = 1508x1508 isim , user similarity formulas below:

enter image description here(isim)

enter image description here(user similarity respect isim)

and code below

load('isim.mat');         isim2 = isim.^2;         = 1 : size(traindata,1)             target_user = traindata(i,:);             mean_target_user = repmat(mean(target_user),length(target_user),1);              k = i+1 : size(traindata,1)                  second_user = traindata(k,:);                  mean_second_user = repmat(mean(second_user),length(second_user),1);                  z = 1 : size(isim , 1)                  pearson{i,k}{z} = sum(isim(z,:) .*(target_user - (mean_target_user')).*(second_user - (mean_second_user')))/sqrt((sum(isim(z,:) .*(target_user - (mean_target_user')).^2)))*sqrt(sum((isim(z,:).*(second_user - (mean_second_user')).^2)));  mean(target_user))*(traindata(k,z)-mean(traindata(k,:)))/sqrt(isim(j,z)*(traindata(i,z)-mean(target_user))^2)*sqrt(isim{j}(z)*(traindata(k,z)-mean(traindata(k,:)))^2);                   end              end            end


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