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while err>errlim   
    s=find(P>0); sn=find(P<=0);
    dd=real(ifft2(fA.*fft2(P,n*2,n*2)));
    u=dd(1:n,1:n)*2.0*dx/pi^2;
    rk=h+u;
    do=mean(rk(s));
    rk=rk-do;
    G=sum(sum(rk(s).*rk(s)));
    pk(s)=rk(s)+G/Gold*pk(s);
    pk(sn)=0;
    Gold=G;
    dd=real(ifft2(fA.*fft2(pk,2*n,2*n)));
    qk=dd(1:n,1:n)*2.0*dx/pi^2;
    rb=mean(qk(s)); qk=qk-rb;
    dp=sum(sum(rk(s).*pk(s)))/sum(sum(qk(s).*pk(s)));
    P(s)=P(s)-dp*pk(s);  s=find(P<=0);P(s)=0;
    sol=find((P==0)&(rk<0));
    P(sol)=P(sol)-dp*rk(sol);
    W=sum(sum(P))*dx*dx; P=charge/W*P;
    err=sqrt(Gold*dx*dx);
end
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