flch9eg2.m

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clc;
clear;
close all;
%===========================================================input character
xp=[-1 1 1 1 1 1 1 1 1 -1 -1 1 1 1 1 1 1 1 1 -1 -1 1 ... 
    1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 -1 -1 -1 -1 -1 -1 ...
    -1 -1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 1 1 1 1 1 ...
    -1 -1 1 1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 ...
    -1 -1 -1 -1 -1 -1 -1 -1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 ...
    1 1 -1 -1 1 1 1 1 1 1 1 1 -1 -1 1 1 1 1 1 1 1 1 -1 ];
%====================================================================
cx=zaosheng(xp,120)  %带25%噪声字符
N=0;
for i=1:1:120
    if  xp(i)~=cx(i); 
        N=N+1;
    end
end
for j=1:50
    if xp==cx;
        disp('succseful!');
        break
    else
        W=xp'*xp-eye(120);
        B=sign(W*cx');
        cx=B';
        D=xp'-B;
    end
    if j>49
        disp('fail')
    end
end
N              %迭代次数