How to run a function

Hi , its the first time I'm using Matlab, I would like to know how can I run this function (that's the implementation of the conjugate gradient

function [ x,fx ,iter,x_vett]=gradiente(f,grad,x0,toll,maxiter)
x=x0;
fx=feval(f,x(1),x(2));
d=-feval(grad,x(1),x(2));
err=norm(d);
iter=0;
x_vett=[x];
while (err>toll) & (iter <=maxiter)
    alpha=linesearch(f,grad,x,d);
    x=x+alpha*d;
    x_vett=[x_vett,x];
    d=-feval(grad,x(1),x(2));
    err=norm(d);
    iter=iter+1;
end
fx=feval(f,x(1),x(2));
if (err>toll) & iter>maxiter
    error('Hai superato il numero max di iterazioni!!!')
end

This is the code of the function "linesearch"

function alpha=linesearch(f,grad,x,d)

    gamma=0.1;
    sigma=1/4;
    alpha=1;
    alphamin= 10^(-3);
    xnew=x+alpha*d;
    while feval(f,xnew(1),xnew(2))>feval(f,x(1),x(2))+... % I cond. di Wolfe
            gamma*alpha*feval(grad,x(1),x(2))'*d & alpha>alphamin
        alpha=sigma*alpha;
        xnew=x+alpha*d;
    end

These are my inputs and errors in the Command window. I'm sure the function is correctly implemented, maybe the problem is in the Command window.

>> f=@(x) [2*x(1)+3*x(2)];
>> x0=[1,2];
>> grad=3;
>> maxiter=10;
>> toll=0.5;
>> [ x,fx ,iter,x_vett]=gradiente(f,grad,x0,maxiter)
Error using @(x)[2*x(1)+3*x(2)]
Too many input arguments.
Error in gradiente (line 8)
fx=feval(f,x(1),x(2));

[Azzi Abdelmalek]

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