MATLAB: What the right function

nead help in function

any body can help me?
i'm a newbie with matlab.
why this function error. "function I= checkered(N,s)"
% Prepare image
     f = zeros(30,30);
     f(5:24,13:17) = 1;
     imshow(f,'notruesize')
       % Compute Fourier Transform
       F = fft2(f,256,256);
       F = fftshift(F); % Center FFT
       % Measure the minimum and maximum value of the transform amplitude
       min(min(abs(F))) %   0
       max(max(abs(F))) % 100
       imshow(abs(F),[0,100]); colormap(jet); colorbar
       imshow(log(1+abs(F)),[0,3]); colormap(jet); colorbar
             % * What is the main difference between representing the amplitude and its logarithm?
       % Look at the phases
       imshow(angle(F),[-pi,pi]); colormap(jet); colorbar
             % * Try with other images
       f = imread('fotokanker1.jpg');
       f = ind2gray(f,gray(256));
            %  * Or more patterned from Yamitani (at Caltech Univ.) homepage.
             % * Checkered images
       function I= checkered(N,s)
       % This function returns a checkered image of size N
       % and with a check size of s
       I=zeros(N,N);
       for i=1:N,
           for j=1:N,
               if (mod(floor(i/s)+floor(j/s),2)==0) I(i,j)=1; end;
           end;
       end;
       f=checkered(256,32); imshow(f);

Best Answer

If checkered is supposed to be a nested function if must be closed with the keyword end.
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