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lag2fqd

于 2010-11-09 发布 文件大小:1KB
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  拉格朗日算法已知三组温度与压力数据:(3,53.5) (4,55.3) (5,56.2)求4.15对应的值为55.492375,结果正确。如果将以上数组顺序颠倒,已知压力55.492375求对应的温度,结果为4.185739,可以看到上下两个结果误差较大,就是说不能象这样去颠倒顺序去求值的。但是实际上我们可能经常要求知道压力去求温度,那么遇到这样的情况,只能采用试算法:一种简单的方法就是二分法迭代,书上都有介绍就不多讲了。(Lagrange method已知三组温度与压力数据:(3,53.5) (4,55.3) (5,56.2)求4.15对应的值为55.492375,结果正确。如果将以上数组顺序颠倒,已知压力55.492375求对应的温度,结果为4.185739,可以看到上下两个结果误差较大,就是说不能象这样去颠倒顺序去求值的。但是实际上我们可能经常要求知道压力去求温度,那么遇到这样的情况,只能采用试算法:一种简单的方法就是二分法迭代,书上都有介绍就不多讲了。)

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