fix parameters in function

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John Miller
John Miller on 22 Sep 2020
Commented: Warren Boschen on 27 Jan 2023
I want to optimize one parameter of a function with three parameters. Lets say the function looks like this
function f = function(t,x)
f = x(1) + x(2) *x(3)
end
How can I transmit the values for x(1) and x(2) but leave x(3) open to a later optimization?

Accepted Answer

Ameer Hamza
Ameer Hamza on 22 Sep 2020
Yes, you can only optimize using selected variables. For example, following use x(3) for optimization, while x(1) and x(2) are fixed.
x1 = 2; % write value of x(1)
x2 = 3; % write value of x(2)
t = 0; % write value of t
x30 = rand(); % initial guess for x3
sol = fmincon(@(x3) myFunction(t, [x1; x2; x3]), x30)
function f = myFunction(t,x)
f = x(1) + x(2) *x(3)
end
  3 Comments
Torsten
Torsten on 27 Jan 2023
sol = fmincon(@(x) myFunction(data1, data2, x(1), x(2)), [x0, y0]);
Warren Boschen
Warren Boschen on 27 Jan 2023
Ah okay. Thank you!

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