why do i have so many errors when trying to use particle swarm optimisation in matlab?

his is my code for the objective function

function y = T(x,c)
% this is the objective function
if x(1)^2-x(2)+1 <= 0
    y = x(1)^2 + x(2)^2;
elseif x(1)^2-x(2)+1 > 0
    if c == 1
        y = x(1)^2 + x(2)^2 + (1/2)*(x(1)^2-x(2)+1)^2;
    elseif c == 10
        y = x(1)^2 + x(2)^2 + (10/2)*(x(1)^2-x(2)+1)^2;
    elseif c == 100
        y = x(1)^2 + x(2)^2 + (100/2)*(x(1)^2-x(2)+1)^2;
    end
end

And here is my script file in trying to obtain optimal values near global optimum by following the example in this link https://uk.mathworks.com/help/gads/optimize-using-particle-swarm-optimization.html

fun = @T;
n = 2;
rng default
[x,fval,exitflag] = particleswarm(fun,n)
lb = [-50;-50];
ub = -lb;
[x,fval,exitflag] = particleswarm(fun,n,lb,ub)
options = optimoptions('particleswarm','SwarmSize',100);
[x,fval,exitflag] = particleswarm(fun,n,lb,ub,options)
options.HybridFCn= @fmincon;
[x,fval,exitflag] = particleswarm(fun,n,lb,ub,options)

after executing the file i get these errors

Error using particleswarm>makeState (line 700)
Failure in initial objective function evaluation. PARTICLESWARM cannot
continue.

Error in particleswarm>pswcore (line 170)
state = makeState(nvars,lbMatrix,ubMatrix,objFcn,options);

Error in particleswarm (line 152)
[x,fval,exitFlag,output] =
pswcore(objFcn,nvars,lbRow,ubRow,output,options);

Error in question_7b (line 5)
[x,fval,exitflag] = particleswarm(fun,n)

Caused by:
   Not enough input arguments.

[Adam]

Just for info, that is only 1 error being reported, it is just giving you the callstack that leads to the error.

Answer 1

[José-Luis]

T, and consequently fun expect two arguments. From the documentation of particle swarm:

"Objective function, specified as a function handle. The objective function should accept a row vector of length nvars and return a scalar value."

The function you pass should only have one argument...

[Sean de Wolski]

c = something;
fun = @(x)T(x,c);

[Maurice Moh]

Hi thanks so much for the tip i have implemented the changes and now i have received another error and

No public property HybridFCn exists for class
optim.options.Particleswarm.
Error in question_7b (line 11)
options.HybridFCn= @fmincon;

Appreciate the help in advance.

[Alan Weiss]

Looks like a typo to me. The correct capitalization is HybridFcn, not HybridFCn.

Alan Weiss

MATLAB mathematical toolbox documentation

Answer 2

[nazli melek]

Thanks José-Luis for your help. I faced the same problem and it is solved now