not enough input arguments

i am trying to run the built in matlab function for particle swram i have defined the objective function spearately na then called that function here is the code

function f = objective(p1,q1,p2,n,m)

f = (p1 * q1 + p2 * n * m );

end 

objfcn = @objective;
nvar = 5;
lb = [-5 -5];
ub = [5 5];
options = optimoptions('particleswarm','swarmsize',100);
f = particleswarm(objective,nvar,lb,ub,options);

kindly help thanks

[aaliyan javaid]

Answer 1

[Cris LaPierre]

You have not set up your objective function correctly, and then you are also not passing it correctly to particleswarm.

From the input section of the particleswarm documentation

• Write the objective function to accept a row vector of length nvars and return a scalar value.

This meains a single input variable, where each column corresponds to the values of each variable. You can split that vector into specific variables inside the objective function if you want, as I do below.

Also, your 'fun' input to particleswarm should be either objfcn or @objective.

nvar = 5;
lb = [-5 -5];
ub = [5 5];
opts = optimoptions('particleswarm','swarmsize',100);
f = particleswarm(@objective,nvar,lb,ub,opts);

function f = objective(params)
p1=params(1);
q1=params(2);
p2=params(3);
n=params(4);
m=params(5);

f = (p1 * q1 + p2 * n * m );

end

Note that this will run now, but it did not find a solution before it was terminated.

[aaliyan javaid]

thanks alot for the help