How can one make this program work? (fmin question)

Question

0 个投票

In Part 1, I have learned that

x_optimal = fminbnd(@fun,0,2)
function out=fun(x)
 
 if x<=1 out=x; else out=sqrt(x); end
 
 out=-out; %because we're maximizing
 
end

Now I want to parameterize this example. I want to define a parameterized function

function out=fun(x,a)
 
 if x<=1 out=x; else out=a*sqrt(x); end
 
 out=-out; %because we're maximizing
 
end

And want to create an output vector

x=zeros(10,1);
for a=1:1:10
    x(a,1)=fminbnd(@fun,0,2) % minimizes fun(x,a)
end

But this code does not work. How can one make the code work?

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Answer 1

Bruno Luong 2020-8-2

1 个投票

x=zeros(10,1);
for a=1:1:10
    x(a,1)=fminbnd(@(x) fun(x,a), 0, 2) % minimizes fun(x,a)
end

Bruno Luong 2020-8-2

" How did you arrive at this solution? "

Strictly speaking I did not arrive at this solution, since I did not search for it.

I simply kwow MATLAB and anonymous function by mainly reading the doc and then practice.

Don't use global variable if you don't have to.

alpedhuez 2020-8-2

Okay.