Passing a function as the input argument of another function

Hi,

I am trying to optimise the parameters of my model to some experimental data. I obviously didnt have the inputs correct...

What shall I include in the input arguments? I want matlab to know I am optimising P.

Huge huge thanks!

mandy

% My parameters that's already in the workspace
    l = 180;
    v_correct = 37;
    data = I;
    %freq in work space
    P0 = [1e9,1.8,1e-4,0.25,1000,1];


% My 1st function generates my model, I want to then pass my model to a
% second function that finds the chi squares between my model and the data
    intensity = @(P) myIntensity(l,v_correct,freq,P);

    
% My 2nd function finds chi squares and gradient, error
    function [chisqr,grad] = myObjective(intensity,data,P)
        chisqr = sum((data - intensity(P)).^2);
        grad = 2*sum(data - intensity(P));
    end

ERROR:

"Not enough input arguments.

Error in untitled>myObjective (line 10)

chisqr = sum((data - intensity(P)).^2);"

% I then pass the 2nd function which is the objective to the fminunc
% function, but this is not correct
    options = optimoptions('fminunc','Algorithm','trust-region','SpecifyObjectiveGradient',true);
    [pfinal,fval,exitflag] = fminunc(@myObjective,P0,options);

ERROR:

"Invalid use of operator.

Undefined function 'objective' for input arguments of type 'double'.

Error in fminunc (line 242)

[f,GRAD] = feval(funfcn{3},x,varargin{:});

Error in untitled (line 15)

[pfinal,fval,exitflag] = fminunc(@objective,P0,options);

Caused by:

Failure in initial objective function evaluation. FMINUNC cannot continue."

Answer 1

[Walter Roberson]

    [pfinal,fval,exitflag] = fminunc(@(P)myObjective(intensity,data,P),P0,options);