Conjugate Gradient Algorithm II
u = ??initial guess ?
r = f – A ? u
? = max( |r| )
? = 0; ? = 0
WHILE (? > ?) DO
? = ? + 1; ?old = ?
? = r ? r
IF (?=1) THEN p = r ELSE p = r + ?/?old p
q = A ? p
? = ? / (p ? q)
u = u + ? p
r = r – ? q
? = max( |r| )
END WHILE
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