如何求下函数的最小值
y=(0.8-x*((1+(6.6*x)^(1/2))/(0.97*x*(6.6+(6.6*x)^(1/2))))^(1/3))^2如何求y取最小值时的x y最小值为0，对应的x ＝1.11601178406975。
对应的详细结果及程序如下：
====== 结果 ======
迭代数: 20
计算用时(时:分:秒:毫秒): 00:00:00:216
计算中止原因: 达到收敛判定标准
优化算法: 标准简面体爬山法 + 通用全局优化法(SM1)
函数表达式: (0.8-x*((1+(6.6*x)^(1/2))/(0.97*x*(6.6+(6.6*x)^(1/2))))^(1/3))^2
目标函数值(最小): 0
x: 1.11601178406975
====== 计算结束 ======
对应的1stopt 程序：
MinFunction (0.8-x*((1+(6.6*x)^(1/2))/(0.97*x*(6.6+(6.6*x)^(1/2))))^(1/3))^2; 本帖最后由 qibbxxt 于 2011-7-1 09:03 编辑
>> f = @(x) (0.8-x*((1+(6.6*x)^(1/2))/(0.97*x*(6.6+(6.6*x)^(1/2))))^(1/3))^2
f =
@(x)(0.8-x*((1+(6.6*x)^(1/2))/(0.97*x*(6.6+(6.6*x)^(1/2))))^(1/3))^2
>> = fminsearch(f,1)
x =
1.1160
fval =
4.1500e-012 太强了 谢谢
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