Find the minimum of a multi-variable function
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Question: Find the minimum of 
in the window [0,2]×[2,4] with increment 0.01 for x and y.
in the window [0,2]×[2,4] with increment 0.01 for x and y. My approach:
syms fun(x,y) fx(x,y) fy(x,y) fxy(x,y) x y
=
;
;
;
;pt=solve([
==0,
==0],[x y]) But it gives me an error.
==0,==0],[x y]) But it gives me an error.besides what about the window and increment mentioned that question. Any solution will be appreciated .
Thanks in advance .
2 个评论
infinity
2019-6-23
Hello,
Could you provide your code and show us what is the error?
emonhossain roy
2019-6-23
采纳的回答
Hello,
In your code, it was not good to put the name like "fun(x,y)". Also, we do not need to declare "fx, fun, fy,.." as symbolic variable. Here is a small code that you can refer
clear
syms x y
fun=x^2+y^2-2*x-6*y+14;
fx=diff(fun,x);
fy=diff(fun,y);
pt=solve([fx==0,fy==0],[x y]);
% pt=solve(fx==0,fy==0);
sol = struct2array(pt)
It will give us the solution
sol =
[ 1, 3]
I have run this code on Matlab2018a. Maybe in your Matlab version, there will be some different.
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