Problem with Barker Ambiguity Simulation Code

We are get this code for simulation for barker ambiguity, but there is error problem. please help us to find solution for the error, so this code can running.

function [ambig] = barker_ambig(uinput)

% Compute and plot the ambiguity function for a Barker code %Compute the ambiguity function % by utilizing the FFT through combining multiple range cuts

N = size(uinput,2);

tau = N;

Barker_code = uinput;

samp_num = size(Barker_code,2) *10;

n = ceil(log(samp_num) / log(2));

nfft = 2^n;

u(1:nfft) = 0;

j = 0;

for index = 1:10:samp_num

    index;

    j = j+1;

    u(index:index+10-1) = Barker_code(j);

end

v = u;

delay = linspace(-tau, tau, nfft);

freq_del = 12 / tau /100;

j = 0;

vfft = fft(v,nfft);

for freq = -6/tau:freq_del:6/tau;

    j = j+1;

    exf = exp(sqrt(-1) * 2. * pi * freq .* delay);

    u_times_exf = u .* exf;

    ufft = fft(u_times_exf,nfft);

    prod = ufft .* conj(vfft);

    ambig(:,j) = fftshift(abs(ifft(prod))');

end

freq = -6/tau:freq_del:6/tau;

delay = linspace(-N,N,nfft);

figure (1)

mesh(freq,delay,ambig ./ max(max(ambig)))

colormap([.5 .5 .5])

colormap(gray)

axis tight

xlabel('frequency')

ylabel('delay')

zlabel('ambiguity function')

figure (2)

value = 10 * N ;

plot(delay,ambig(:,51)/value,'k')

xlabel('delay')

ylabel('normalized amibiguity cut for f=0')

grid

axis tight

figure (3)

contour(freq,delay,ambig ./ max(max(ambig)))

colormap([.5 .5 .5])

colormap (gray)

xlabel('frequency')

ylabel('delay')

grid on

The error is :

>> barker_ambig

Error using barker_ambig (line 5)

Not enough input arguments.