fix parameters in function

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John Miller
John Miller 2020-9-22
评论： Warren Boschen 2023-1-27
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?

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Ameer Hamza
Ameer Hamza 2020-9-22
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
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Torsten
Torsten 2023-1-27
sol = fmincon(@(x) myFunction(data1, data2, x(1), x(2)), [x0, y0]);

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