Collaborative Filtering

 

 

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for i=1:6040 Ai=ratings(ratings(:,1)==i,:); for j=1:5 Labnum(i,j)=length(Ai(Ai(:,3)==j)); end num(i)=length(Ai(:,1)); end

num=[[1:6040]',num'];
numsort=sortrows(num,-2);

　　

 

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Xratings1101_1500=[]; for i=1:1501 Xratings1101_1500=[Xratings1101_1500;ratingsNew1101_518(ratingsNew1101_518(:,1)==numsort1101(i,1),:)]; end

　　

 

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items1101_518=ratings(ratings(:,1)==1101,2); ratings1101_518=[]; for i=1:518 items=items1101_518(i); ratings1101_518=[ratings1101_518;ratings(ratings(:,1)==items,:)]; end users1101_518 = unique(ratings1101_518(:,1)');

　　

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items1101_518=ratings(ratings(:,1)==1101,2); ratings1101_518=[]; for i=1:518 items=items1101_518(i); ratings1101_518=[ratings1101_518;ratings(ratings(:,2)==items,:)]; end items1101_518=sortrows(items1101_518,1);   ratingsNew1101_518=ratings1101_518; for i=1:518 ratingsNew1101_518(ratingsNew1101_518(:,2)==items1101_518(i),2)=i; end ratingsNew1101_518=sortrows(ratingsNew1101_518,2);

　　

 

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Xratings1101_1500=[]; for i=1:1501 Xi=ratings1101_518(ratings1101_518(:,1)==numsort1101(i,1),:); Xi(:,1)=i; Xratings1101_1500=[Xratings1101_1500;Xi]; end

　

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Xratings1101_1500=[]; for i=1:1501 Xi=ratingsNew1101_518(ratingsNew1101_518(:,1)==numsort1101(i,1),:); Xi(:,1)=i; Xratings1101_1500=[Xratings1101_1500;Xi]; end

　　

　

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X1101=zeros(1501,518); >> for i=1:size(Xratings1101_1500,1) X1101(Xratings1101_1500(i,1),Xratings1101_1500(i,2)) = Xratings1101_1500(i,3); end