?? cgdft.m
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function cgdft
% function cgdft compute DFT coefficients using DIT FFT algorithm
% function cgfft.m is used to implement the constant geometry FFT
clear all;
direction = 1; %1 - forward DFT, -1 - inverse DFT
in=fopen('datain.dat','r');
[x,count]=fscanf(in,'%g %g',[2 inf]);
fclose(in);
x = x(1,:)+x(2,:)*i; % form complex numbers
npt = 2^(nextpow2(count/2)); % find the next power of two
x(1:npt) = [x; zeros(npt-count/2,1)]; % x is padded with trailing zeros to npt
y=cgfft(x,npt,direction); % calculate the constant geometry FFT
% Save/Print the results
out=fopen('dataout.dat','w');
fprintf(out,'%g %g\n',[real(y); imag(y)]);
fclose(out);
subplot(2,1,1),plot(1:npt,x); title('Input Signal');
subplot(2,1,2),plot(1:npt,y); title('Output Signal');
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