Asked by ayman osama
on 5 Dec 2012

for K=0:7 for N=0:3 if mod(K,2)==0 v(N+1)=(x(N+1)+x(N+5))*exp(-1i*N*K*pi/2); elseif mod(K,2)==1 v(N+1)=((x(N+1)-x(N+5))*exp(-1i*N*pi/4))*exp(-1i*N*K*pi/2); end

end Y(K+1)=sum(v); end

i assume that is radix 2 disspation in frequency what's wron in it

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Answer by Azzi Abdelmalek
on 6 Dec 2012

Edited by Azzi Abdelmalek
on 6 Dec 2012

x=rand(1,8); % Example xo=x(2:2:end); % odd part xe=x(1:2:end); % even part for N=0:3 for k=0:3 Xo(k+1)=xo(k+1)*exp(-j*2*k*N*pi/4) Xe(k+1)=xe(k+1)*exp(-j*2*k*N*pi/4) end Yo(N+1)=sum(Xo) Ye(N+1)=sum(Xe) Y(N+1)=Ye(N+1)+exp(-j*2*N*pi/n)*Yo(N+1) Y(N+5)=Ye(N+1)-exp(-j*2*N*pi/n)*Yo(N+1) end

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## 2 Comments

## Walter Roberson (view profile)

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/55824#comment_115570

Are you seeing an error message? If not then what difference do you see between what you are getting and what you expected?

## ayman osama (view profile)

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/55824#comment_115573

no i didn'y got an error msg i should have fft of x what i see that the first term in fft is right and other terms are wrong i was using dissipation in frequency teq.