Why this code (Barker Ambiguity) error ?

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.

The code is :

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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')

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The error is :

>> barker_ambig

Error using barker_ambig (line 5)

Not enough input arguments.

Answer 1

[Walter Roberson]

You need to pass the barker code to be processed into the function.

For example,

Lassy = rand(7,19);
barker_ambig(Lassy)