作业帮采用0.618法求在区间[0,1]内函数f (x)=x(x-1)2(x-2)3的最小值 vc++编程、、、谢~#includeusing namespace std;const float EPS=0.000001;//定义常量float f(float);//定义函数ffloat f(float x){return x*(x－1)^2*(x－2)^3;}void main()
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![采用0.618法求在区间[0,1]内函数f (x)=x(x-1)2(x-2)3的最小值 vc++编程、、、谢~#includeusing namespace std;const float EPS=0.000001;//定义常量float f(float);//定义函数ffloat f(float x){return x*(x－1)^2*(x－2)^3;}void main()](/uploads/image/z/6102102-30-2.jpg?t=%E9%87%87%E7%94%A80.618%E6%B3%95%E6%B1%82%E5%9C%A8%E5%8C%BA%E9%97%B4%5B0%2C1%5D%E5%86%85%E5%87%BD%E6%95%B0f+%28x%29%3Dx%28x-1%292%28x-2%293%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC+vc%2B%2B%E7%BC%96%E7%A8%8B%E3%80%81%E3%80%81%E3%80%81%E8%B0%A2%7E%23includeusing+namespace+std%3Bconst+float+EPS%3D0.000001%3B%2F%2F%E5%AE%9A%E4%B9%89%E5%B8%B8%E9%87%8Ffloat+f%28float%29%3B%2F%2F%E5%AE%9A%E4%B9%89%E5%87%BD%E6%95%B0ffloat+f%28float+x%29%7Breturn+x%2A%28x%EF%BC%8D1%29%5E2%2A%28x%EF%BC%8D2%29%5E3%3B%7Dvoid+main%28%29)
采用0.618法求在区间[0,1]内函数f (x)=x(x-1)2(x-2)3的最小值 vc++编程、、、谢~#includeusing namespace std;const float EPS=0.000001;//定义常量float f(float);//定义函数ffloat f(float x){return x*(x－1)^2*(x－2)^3;}void main()
采用0.618法求在区间[0,1]内函数f (x)=x(x-1)2(x-2)3的最小值 vc++编程、、、谢~
#include
using namespace std;
const float EPS=0.000001;//定义常量
float f(float);
//定义函数f
float f(float x)
{
return x*(x－1)^2*(x－2)^3;
}
void main()
{
float a,b,x1,x2,f1,f2,ε,eps;
couta;
coutb;
couteps;
x1=a+0.382*(b-a);x2=a+0.618*(b-a);
f1=f(x1);f2=f(x2);
while (b-a>eps)//搜索精度循环节
{
=f1-f2;
if (ε>EPS) {a=x1;x1=x2;f1=f2;x2=a+0.618*(b-a);f2=f(x2);}
else if (ε>=-EPS && ε
采用0.618法求在区间[0,1]内函数f (x)=x(x-1)2(x-2)3的最小值 vc++编程、、、谢~#includeusing namespace std;const float EPS=0.000001;//定义常量float f(float);//定义函数ffloat f(float x){return x*(x－1)^2*(x－2)^3;}void main()
帮你改了一下,请看一下.
#include<iostream>
using namespace std;
const float EPS=0.000001;//定义常量
float f(float);
//定义函数f
float f(float x)
{
return x*(x-1)*(x-1)*(x-2)*(x-2)*(x-2);//这里的减号是全角字符,必须改为半角；还有符号“^”必须用于整型,无法用于浮点型.
}
void main()
{
float a,b,x1,x2,f1,f2,alf,eps;//编译器认为ε是非法变量名,暂改名为alf,下同
cout<<"a=0";cin>>a;
cout<<"b=1";cin>>b;
cout<<"eps=0.001";cin>>eps;
x1=a+0.382*(b-a);x2=a+0.618*(b-a);
f1=f(x1);f2=f(x2);
while (b-a>eps)//搜索精度循环节
{
alf=f1-f2;//这里等号左边少了变量,是ε?暂时已经换成了alf了.
if (alf>EPS) {a=x1;x1=x2;f1=f2;x2=a+0.618*(b-a);f2=f(x2);}
else if (alf>=-1*EPS && alf<=EPS) {a=x1;b=x2;x1=a+0.382*(b-a);x2=a+0.618*(b-a);f1=f(x1);f2=f(x2);}//函数值相等,两边区间均舍去
else {b=x2;x2=x1;f2=f1;x1=a+0.382*(b-a);f1=f(x1);}
}
cout<<"x*="<<(a+b)/2;
system ("pause");
}