Finding global minimum with rand

6 次查看（过去 30 天）
Ikenna Iwudike
Ikenna Iwudike 2022-4-2
评论： Ikenna Iwudike 2022-4-2
I'm supposed to use the MATLAB function "rand" to generate a large number of random vectors in 3-space, with coordinates between −6 and 6. Then I have to evaluate f at those points to find the minimum. But I don't know if I'm doing it correctly. My function is f(x, y,z) = x^4 + y^4 + z^4 − 3*x^2 − 8*y^2 − 6*x*z − 4*x*y − 10*z^2 + 6*y. Here's what I have so far:

请先登录，再回答此问题。

采纳的回答

Torsten
Torsten 2022-4-2
编辑：Torsten 2022-4-2
fumin = Inf;
for i = 1:100000
u = -6 + 12*rand(3,1);
fu = f(u);
if fu < fumin
umin = u;
fumin = fu;
end
end
  3 个评论
显示 1更早的评论
Torsten
Torsten 2022-4-2
编辑：Torsten 2022-4-2
This error message cannot stem from my code above.
At least if f is defined as you showed us:
f = @(u) u(1)^4 ... etc.
Ikenna Iwudike
Ikenna Iwudike 2022-4-2
Oh ok, I didn't add that in. Thanks.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Shifting and Sorting Matrices 的更多信息

标签

产品


版本

R2021a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by