黄金分割法matlab 我在-3到5的区间求 x^2+2x的最小值 下面程序哪错了?>> a=-3,b=5,e=0.0001,t=0.618;>> u=b-a;>> a1=b-t*u,f1=a1^2+2*a1;>> a2=a+t*u,f2=a2^2+2*a2;>> while u>eif f1>f2 a=a1,a1=a2,f1=f2,a2=a+t*u,f2=a2^2+2*a2;else b=a2,a2=a
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![黄金分割法matlab 我在-3到5的区间求 x^2+2x的最小值 下面程序哪错了?>> a=-3,b=5,e=0.0001,t=0.618;>> u=b-a;>> a1=b-t*u,f1=a1^2+2*a1;>> a2=a+t*u,f2=a2^2+2*a2;>> while u>eif f1>f2 a=a1,a1=a2,f1=f2,a2=a+t*u,f2=a2^2+2*a2;else b=a2,a2=a](/uploads/image/z/5244476-68-6.jpg?t=%E9%BB%84%E9%87%91%E5%88%86%E5%89%B2%E6%B3%95matlab+%E6%88%91%E5%9C%A8-3%E5%88%B05%E7%9A%84%E5%8C%BA%E9%97%B4%E6%B1%82+x%5E2%2B2x%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC+%E4%B8%8B%E9%9D%A2%E7%A8%8B%E5%BA%8F%E5%93%AA%E9%94%99%E4%BA%86%3F%3E%3E+a%3D-3%2Cb%3D5%2Ce%3D0.0001%2Ct%3D0.618%3B%3E%3E+u%3Db-a%3B%3E%3E+a1%3Db-t%2Au%2Cf1%3Da1%5E2%2B2%2Aa1%3B%3E%3E+a2%3Da%2Bt%2Au%2Cf2%3Da2%5E2%2B2%2Aa2%3B%3E%3E+while+u%3Eeif+f1%3Ef2+a%3Da1%2Ca1%3Da2%2Cf1%3Df2%2Ca2%3Da%2Bt%2Au%2Cf2%3Da2%5E2%2B2%2Aa2%3Belse+b%3Da2%2Ca2%3Da)
黄金分割法matlab 我在-3到5的区间求 x^2+2x的最小值 下面程序哪错了?>> a=-3,b=5,e=0.0001,t=0.618;>> u=b-a;>> a1=b-t*u,f1=a1^2+2*a1;>> a2=a+t*u,f2=a2^2+2*a2;>> while u>eif f1>f2 a=a1,a1=a2,f1=f2,a2=a+t*u,f2=a2^2+2*a2;else b=a2,a2=a
黄金分割法matlab 我在-3到5的区间求 x^2+2x的最小值 下面程序哪错了?
>> a=-3,b=5,e=0.0001,t=0.618;
>> u=b-a;
>> a1=b-t*u,f1=a1^2+2*a1;
>> a2=a+t*u,f2=a2^2+2*a2;
>> while u>e
if f1>f2
a=a1,a1=a2,f1=f2,a2=a+t*u,f2=a2^2+2*a2;
else b=a2,a2=a1,f2=f1,a1=b-t*u,f1=a1^2+2*a2;
end
u=b-a;
end
黄金分割法matlab 我在-3到5的区间求 x^2+2x的最小值 下面程序哪错了?>> a=-3,b=5,e=0.0001,t=0.618;>> u=b-a;>> a1=b-t*u,f1=a1^2+2*a1;>> a2=a+t*u,f2=a2^2+2*a2;>> while u>eif f1>f2 a=a1,a1=a2,f1=f2,a2=a+t*u,f2=a2^2+2*a2;else b=a2,a2=a
条件语句里的a2 = a + t * u和a1 = b - t * u有问题,这里的u还是上一次b-a的值,还没有更新呢.要么把u=b-a移到这之前,要么把系数修改成(1-t).