穆勒的算法 2.8
To find a solution to f(x) = 0 given three approximations x0, x1
and x2:
INPUT: x0,x1,x2; tolerance TOL; maximum number of iterations NO.
OUTPUT: approximate solution p or message of failure.
这种实现允许切换到复杂的算法。
系数都存储在向量 A，所以该维度
A 可能产生的将被改变。
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