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researchv10 Dan Cross

alfa = <>; beta = 0; q = <>; p = p(:,1)/norm(p(:,1));
t = A'*p(:,1);
alfa(1) = norm(t);
q(:,1) = t/alfa(1);
X = p(:,1)*(alfa(1)*q(:,1))'
e(1) = norm(A-X,1)
for j = 2:r, exec('pdqstep',ip); ...
   X = X + p(:,j)*(alfa(j)*q(:,j)+beta(j)*q(:,j-1))', ...
   e(j) = norm(A-X,1)

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