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3Â¥2010-03-24 21:21:14
string121
½ð³æ (СÓÐÃûÆø)
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- ×¢²á: 2009-07-17
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cheer.up20(½ð±Ò+10):Ì«¸ÐлÁË£¡ºÃÈËÒ»Éúƽ°² 2010-03-24 20:53
cheer.up20(½ð±Ò+5): 2010-03-24 20:56
cheer.up20(½ð±Ò+5): 2010-03-24 20:56
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µü´ú×îС¶þ³Ë Matlab code : Y=rand(20,1); % set Y. H=rand(20,20);% set H. X=zeros(size(Y));%initial value X_0. dt=1.8/max(eig(H'*H)); % a time step parameter, 0 err_1=1e-3; % the stopping criterion. err_2=100; iter=0; while err_2>err_1 X=X-dt*(H'*(H*X-Y)); %update X. iter=iter+1; err_2=sum((H*X-Y).^2); %compute the residuals if mod(iter,1000)==1 fprintf(['Iteration %d: the residuals is %f\n'],iter,err_2); %display in the window. end end fprintf('The algorithm is convereged at the %dth iteration with residuals=%f\n',iter,err_2); ¼«´óËÆÈ»µÄ»°ÒªÓжÔVµÄ·Ö²¼¼ÙÉè¡£Èç¹û¼ÙÉèÿ´Î¹Û²âËù²úÉúµÄÎó²îVÊǶÀÁ¢Í¬¸ß˹·Ö²¼ÇÒ·½²îÒÑÖª£¬Ôò¼«´óËÆÈ»µÃµ½µÄ½á¹ûµÈͬ×îС¶þ³Ë£¨Å·ÊϾàÀëÒâÒåÏ£©¡£ Èô¼ÙÉèVÊÇÆäËû·Ö²¼£¬Ôò½á¹ûÓëÆÕͨ×îС¶þ³ËÓвîÒì¡£Òª¼ÆËãµÄ»°Ò²ºÜ¼òµ¥£¬Ð´³ö¶ÔËÆÈ»·ºº¯µÄ±ä·Ö£¬½«ÉÏÊö´úÂëÖÐµÄ H'*(H*X-Y)»»³É¼ÆËãÉÏÊö±ä·ÖËùµÃµ½µÄ±í´ïʽ¼´¿É¡£ÈôVµÄ·Ö²¼±È½ÏÌØ±ð£¬Ëù²úÉúµÄËÆÈ»º¯Êý²»ÊÇÏßÐԵģ¬ÔòÉÏÊöµü´ú²½³¤dtµÄѡȡ²»Ò»¶¨Äܱ£Ö¤µü´úÊÕÁ²¡£ÕâʱÐèҪһЩ¸´ÔÓÒ»µãµÄÓÅ»¯¹¤¾ß£¬ÀýÈçÏßËÑË÷¡£ |
2Â¥2010-03-24 18:46:16
string121
½ð³æ (СÓÐÃûÆø)
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- ½ð±Ò: 809.5
- ºì»¨: 3
- Ìû×Ó: 117
- ÔÚÏß: 173.2Сʱ
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- ×¢²á: 2009-07-17
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- רҵ: ¼ÆËãÊýѧÓë¿ÆÑ§¹¤³Ì¼ÆËã
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cheer.up20(½ð±Ò+10):лл£¬¿É·ñ¼ÓÄãQQ435033488 2010-03-25 09:14
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cheer.up20(½ð±Ò+10):лл£¬¿É·ñ¼ÓÄãQQ435033488 2010-03-25 09:14
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»ù±¾Ò»Ñù¡£ % problem: Y=HX+V. %input: Y--m*n % H--m*s %output: X--s*n. m=18;n=20;s=22;%set dimensions Y=rand(m,n); % set Y. H=rand(m,s);% set H. X=zeros(s,n);%initial value X_0. dt=1.8/max(eig(H'*H)); % a time step parameter, 0 err_1=1e-3; % the stopping criterion. err_2=100; iter=0; while err_2>err_1 X=X-dt*(H'*(H*X-Y)); %update X. iter=iter+1; err_2=norm(H*X-Y,'fro'); %compute the residuals if mod(iter,1000)==1 fprintf(['Iteration %d: the residuals is %f\n'],iter,err_2); %display in the window. end end fprintf('The algorithm is convereged at the %dth iteration with residuals=%f\n',iter,err_2); |
4Â¥2010-03-24 21:54:29
5Â¥2010-03-24 22:47:18














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