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迭代 - Wikipedia

迭代

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-{A|zh-cn:迭代;zh-tw:疊代}-数值分析中通过从一个初始估计出发寻找一系列近似解来解决问题(一般是解方程或者方程组)的过程,为实现这一过程所使用的方法统称为迭代法

跟迭代法相对应的是直接法(或者称为一次解法),即一次性解决问题,例如通过开方解决方程x2 = 4。一般如果可能,直接解法总是优先考虑的。但当遇到复杂问题时,特别是在未知量很多,方程为非线性时,我们无法找到直接解法(例如五次以及更高次的代数方程没有解析解,参见阿贝耳定理),这时候或许可以通过迭代法寻求方程(组)的近似解。

最常见的迭代法是牛顿法。其他还包括最速下降法、共轭迭代法、变尺度迭代法、最小二乘法线性规划、非线性规划、单纯型法、惩罚函数法、斜率投影法、遗传算法模拟退火等等。

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