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0022 function [nsv,al3,bi]=irwls_pd_svr_nobias(x,y,H,C,D,epsi,F);
0023
0024 T=clock;
0025 if (nargin<7 | nargin>7)
0026 help irwls_adapta_nobias2
0027 else
0028
0029 tol=10^-4;
0030 K=10^8;
0031 val_a=100;
0032 N=length(x);
0033 ns=-1;
0034 k=1;
0035 hacer=1;
0036 bi=0;
0037
0038 i1p=1:2:N;
0039 i1n=2:2:N;
0040 i1=[i1p i1n];
0041
0042 epsi = epsi./F;
0043
0044 a(i1)=C*D(i1);
0045 al3=zeros(N,1);
0046 bi=0;
0047 i2p=[];
0048 i2n=[];
0049 e=y;
0050
0051 while(hacer)
0052 al3_a=al3;
0053 bi_a=bi;
0054 al3=zeros(N,1);
0055 al3(i2p)=C*D(i2p);
0056 al3(i2n)=-C*D(i2n);
0057
0058 if(length(i1))
0059
0060 Xi=inv(H(i1,i1)+diag(1./(a(i1))));
0061 E=ones(N,1);
0062 E(i1n)=-1;
0063
0064 if (length(i2n)==0) & (length(i2p)==0)
0065 aux=Xi*(y(i1)-E(i1).*epsi(i1));
0066 elseif (length(i2n)==0) & (length(i2p)~=0)
0067 aux=Xi*(y(i1)-E(i1).*epsi(i1)-C*H(i1,i2p)*D(i2p));
0068 elseif (length(i2n)~=0) & (length(i2p)==0)
0069 aux=Xi*(y(i1)-E(i1).*epsi(i1)+C*H(i1,i2n)*D(i2n));
0070 else
0071 aux=Xi*(y(i1)-E(i1).*epsi(i1)+C*H(i1,i2n)*D(i2n)-C*H(i1,i2p)*D(i2p));
0072 end;
0073
0074 al3(i1)=aux(1:length(i1));
0075
0076 bi=0;
0077 end
0078
0079 e_a=e;
0080
0081 I=find(al3-al3_a);
0082 if(length(I))
0083 e=e_a-H(:,I)*(al3(I)-al3_a(I));
0084 end
0085
0086 if((max(abs(e-e_a))<tol & k>(ns+1)) | k>=2000)
0087 nsv=length(i1)+length(i2n)+length(i2p);
0088 hacer=0;
0089 else
0090
0091 i1p=find(e>epsi);
0092 i1n=find(e<-epsi);
0093 i2p=find(e>epsi & al3==C*D);
0094 i2n=find(e<-epsi & al3==-C*D);
0095
0096 a=zeros(N,1);
0097 a(i1p)=C*D(i1p)./(e(i1p)-epsi(i1p));
0098 a(i1n)=-C*D(i1n)./(e(i1n)+epsi(i1n));
0099 a(find(a>K))=K;
0100
0101 i2p_c=find(al3>=(C*D-C*D/100) & al3<=(C*D+C*D/100) & e>epsi & a<val_a);
0102 i2p_c=setdiff(i2p_c',i2p)';
0103 i2p=sort([i2p' i2p_c'])';
0104 i1p=setdiff(i1p',i2p)';
0105
0106 i2n_c=find(al3>=(-C*D-C*D/100) & al3<=(-C*D+C*D/100) & e<-epsi & a<val_a);
0107 i2n_c=setdiff(i2n_c',i2n)';
0108 i2n=sort([i2n' i2n_c'])';
0109 i1n=setdiff(i1n',i2n)';
0110
0111 i1=[i1p;i1n];
0112
0113 if(length(i1)==0)
0114 [val,pos]=min(e(i2p));
0115 i1p=i2p(pos);
0116 i2p=setdiff(i2p',i1p)';
0117 a(i1p)=C*D(i1p)./(e(i1p)-epsi(i1p));
0118
0119 [val,pos]=max(e(i2n));
0120 i1n=i2n(pos);
0121 i2n=setdiff(i2n',i1n)';
0122 a(i1n)=C*D(i1n)./(e(i1n)-epsi(i1n));
0123 end
0124
0125 k=k+1;
0126 if(rem(k,20)==0 & max(abs(e-e_a))<(tol*10))
0127 val_a=min(val_a*2,1000);
0128 end
0129 end
0130 end
0131 end