Find minimum of multi-variable function on fixed interval with additional parameter inputs
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Tom Leblicq
le 17 Mar 2021
Réponse apportée : Alan Weiss
le 18 Mar 2021
Hello all,
I would like to find the minimum of a family of functions on a fixed interval.
function yx = test_function(x,xin2)
a=xin2(1);
b=xin2(2);
c=xin2(3);
yx = abs((x(1)*x(2))/4 + ((x(1)^2*x(2)^2)/a + (x(1)*x(2))/b - 1/4)^(c) + 1/2)+x(3);
Thus, I would like to find the minimum of yx (which is determined by x(1), x(2) and x(3)) for a given set of values for a,b,c.
As I would like to repeat this exercise for a large number of combinations of a,b,c I would like to be able to change these automatically in a loop.
xin2=[16,4,1/2];
lb = [0 0 0];
ub = [1 1 1];
f=@test_function;
[x, fval] = fmincon(f(x,xin2), [rand(), rand(), rand()], A, b, Aeq, Beq, lb, ub)
The error message I get:
Error using optimfcnchk (line 101)
FUN must be a function, a valid character vector expression, or an inline function object.
Error in fmincon (line 415)
funfcn = optimfcnchk(FUN,'fmincon',length(varargin),funValCheck,flags.grad,flags.hess,false,Algorithm);
Error in Untitled2 (line 51)
[x, fval] = fmincon(f(x,xin2), [rand(), rand(), rand()], A, b, Aeq, Beq, lb, ub)
Can someone help me?
Kind regadrs,
Tom
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Alan Weiss
le 18 Mar 2021
You need to pass the parameters correctly. See Passing Extra Parameters. In your case, you need to either nest the function in a function that changes the parameters, or recreate an anonymous function each time, something like
xin = [16 4 1/2];
f = @(x)test_function(x,xin);
[x, fval] = fmincon(f, rand(1,3), A, b, Aeq, Beq, lb, ub)
Alan Weiss
MATLAB mathematical toolbox documentation
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