MATLAB: Why do i have so many errors when trying to use particle swarm optimisation in matlab

particleswarmoptimisation

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.

Best Answer

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...
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