%利用Adjusted?Cosine法計算用戶a和b的相似度
function?Sim_ab=Similarity_ab（score_matrixij）
%找出用戶i和j共同評價電影的標號；
temp=score_matrix（i:）&score_matrix（j:）;
P_ab=find（temp）;
%用行向量存儲用戶i和j共同評價的電影
%?%end
%%?利用Adjusted?Cosine法計算相似度
if?isempty（P_ab）
????Sim_ab=0;
else???
????[~temp]=size（P_ab）;%用戶i和j共同評價電影的數(shù)目
????%[~number_movies]=size（score_matrix）;
????sum1=0;
????sum2=0;
????sum3=0;

????????[~m1]=size（find（score_matrix（i:）~=0））;%計算該用戶評價的電影個數(shù)
????????sum_score_a=sum（score_matrix（i:）2）;%用戶對所有電影的總評分
????????aver_score_a=sum_score_a/m1;
????????
????????[~m2]=size（find（score_matrix（j:）~=0））;%計算該用戶評價的電影個數(shù)
????????sum_score_b=sum（score_matrix（j:）2）;%用戶對所有電影的總評分
????????aver_score_b=sum_score_b/m2;
???????
????for?k=1:temp?%注意此處的temp已經(jīng)不是數(shù)組了????????
????????sum1=sum1+（score_matrix（iP_ab（k））-aver_score_a）*（score_matrix（jP_ab（k））-aver_score_b）;
????????sum2=sum2+（score_matrix（iP_ab（k））-aver_score_a）^2;
????????sum3=sum3+（score_matrix（jP_ab（k））-aver_score_b）^2;
????end
????if?sum2==0||sum3==0
????????Sim_ab=0;
????else
????????Sim_ab=sum1/sqrt（sum2*sum3）;
????end
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????716??2015-09-18?11:19??UserbaseCF\ml-100k\allbut.pl

?????文件????????643??2015-09-18?11:19??UserbaseCF\ml-100k\mku.sh

?????文件???????6403??2015-09-18?11:19??UserbaseCF\ml-100k\README

?????文件????1979173??2015-09-18?11:19??UserbaseCF\ml-100k\u.data

?????文件????????202??2015-09-18?11:19??UserbaseCF\ml-100k\u.genre

?????文件?????????36??2015-09-18?11:19??UserbaseCF\ml-100k\u.info

?????文件?????236344??2015-09-18?11:19??UserbaseCF\ml-100k\u.item

?????文件????????193??2015-09-18?11:19??UserbaseCF\ml-100k\u.occupation

?????文件??????22628??2015-09-18?11:19??UserbaseCF\ml-100k\u.user

?????文件????1586544??2015-09-18?11:19??UserbaseCF\ml-100k\u1.base

?????文件?????392629??2015-09-18?11:19??UserbaseCF\ml-100k\u1.test

?????文件????1583948??2015-09-18?11:19??UserbaseCF\ml-100k\u2.base

?????文件?????395225??2015-09-18?11:19??UserbaseCF\ml-100k\u2.test

?????文件????1582546??2015-09-18?11:19??UserbaseCF\ml-100k\u3.base

?????文件?????396627??2015-09-18?11:19??UserbaseCF\ml-100k\u3.test

?????文件????1581878??2015-09-18?11:19??UserbaseCF\ml-100k\u4.base

?????文件?????397295??2015-09-18?11:19??UserbaseCF\ml-100k\u4.test

?????文件????1581776??2015-09-18?11:19??UserbaseCF\ml-100k\u5.base

?????文件?????397397??2015-09-18?11:19??UserbaseCF\ml-100k\u5.test

?????文件????1792501??2015-09-18?11:19??UserbaseCF\ml-100k\ua.base

?????文件?????186672??2015-09-18?11:19??UserbaseCF\ml-100k\ua.test

?????文件????1792476??2015-09-18?11:19??UserbaseCF\ml-100k\ub.base

?????文件?????186697??2015-09-18?11:19??UserbaseCF\ml-100k\ub.test

?????文件???????1224??2015-10-30?12:54??UserbaseCF\Similarity_ab.m

?????文件????5754611??2015-10-30?14:01??UserbaseCF\SimilitudUsers.mat

?????文件???????2988??2015-10-30?14:02??UserbaseCF\Testread.m

?????文件????1586544??2015-09-18?11:19??UserbaseCF\u1.base

?????文件?????392629??2015-09-18?11:19??UserbaseCF\u1.test

?????目錄??????????0??2016-03-14?21:56??UserbaseCF\ml-100k

?????目錄??????????0??2016-03-14?21:55??UserbaseCF

............此處省略3個文件信息