清空筛选条件
清空筛选条件

How to write code for projected gradient descent?

13 次查看（过去 30 天）
Zhenwei Yu
Zhenwei Yu 2020-11-26
回答： Aditya Patil 2020-12-23
clc;
clear;
a=0.01;
x=[0;0;0]
b=1
for i=1:1000
if b<10^-6
break
end
r=x-a*f(x)
b=proj(r-x)
x=r
end
display(x)
I want to write a code to find projected gradient descent of a function. (f(x) is gradient of a function, it is not the function itself)
I'm thinking about define a function proj(). But I don't understand how to write the argmin norm(x-y)^2 part
function f=proj(x)
...
end
Can you give me an example on how to write this code?

请先登录，再回答此问题。

回答（1 个）

Aditya Patil
Aditya Patil 2020-12-23
The min function in MATLAB optionally returns the index of the minimum value. You can calculate the function for all input values, and then use the minimum index to find which inputs are the argmin.
A = [1 9 -2; 8 4 -5]
[M,I] = min(A)

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息

标签

产品


版本

R2020b

Community Treasure Hunt

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

Start Hunting!

Translated by