Can matlab pso toolbox optimize a @(x,y) function?

Hello everyboody! I'm trying to run the following code but I'm getting error:

f = @(x,y)sin(sqrt(x.^2+y.^2))/sqrt(x.^2+y.^2);
nvar = 2;
[x,fval] = particleswarm(f, nvar);

The error says:

    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 Untitled (line 5)
    [x,fval] = particleswarm(f, nvar);

    Caused by:
        Not enough input arguments.

Despite It says that there's "Not enough input arguments.", I saw many examples that was only necessary the function and the number of variables as input arguments.

Answer 1

[Matt J]

It is your objective function that must take only a single argument,

f = @(p) sin(sqrt(p(1).^2+p(2).^2))/sqrt(p(1).^2+p(2).^2);

[Daniel Caliari]

I changed the way you said and worked perfectly!Thanks! Is the expression:

f = @(p) sin(sqrt(p(1).^2+p(2).^2))/sqrt(p(1).^2+p(2).^2)

mathematically equivalent to the one below?

f = @(x,y)sin(sqrt(x.^2+y.^2))/sqrt(x.^2+y.^2);

I tried to plot the new expression using fsurf(), but I was unsuccessful. Is there a way to do it?

[Matt J]

Yes, it is equivalent. For plotting purposes, you can obtain a two- argument equivalent as follows,

g=@(x,y) f([x,y]);

[Daniel Caliari]

Ok, thanks!