Too many input arguments in MATLAB

Question

When I run the following code:

xdata2 = [1 3 4 5];
ydata2 = [3 9 76 73];
params = [0.1 0.5 0.0 -0.5 0.2 0.8];
y = svenssontest2(xdata2,ydata2,params,0.636,1.9632);

I get the error message "Too many input arguments", but the number of input arguments is correct. Here's the code for the function svenssontest2:

function [alpha L1 L2] = svenssontest2(tau,Y,params,L1,L2)

tau=tau.';
Y=Y.';

nObs=length(Y);

%z=1;

%for(j =1:50)

    %L2=j/200+0.01;

    %for(k=1:50)

     %   L1=k/200+0.01;

        Lev1= [params(1)*ones(nObs,1) params(2)*(1-exp(-params(5).*tau))./(params(5).*tau) params(3)*((1-exp(-params(5).*tau))./(params(5).*tau)-exp(-params(5).*tau)) params(4)*((1-exp(-params(6).*tau))./(params(6).*tau)-exp(-params(6).*tau))];

        Y=Y-Lev1;

        G= [ones(nObs,1) (1-exp(-L1.*tau))./(L1.*tau) (1-exp(-L1.*tau))./(L1.*tau)-exp(-L1.*tau) (1-exp(-L2.*tau))./(L2.*tau)-exp(-L2.*tau)];

        alpha =G\Y;
        u=Y-G*alpha
        stderr=sqrt(diag((u'*u)/(length(Y)-4)*pinv(G'*G)));
        Sum_u2 = sum(u.^2);
        Res(1,:) = [Sum_u2 alpha' L1 L2];
    %   z=z+1;

   % end

Answer 1

You probably have another file, with the same name and different number of arguments, somewhere in your Path settings, before the Path of this file. Because files are searched top down, the other file is found first, causing this error.