%DFT
close all;
clear all;
N=input('Howmany point DFT do you want?');
x2=input('Enter the sequence=');
n2=length(x2);
c= zeros(N);
x2=[x2 zeros(1,N-n2)];
for k=1:N
for n=1:N
w=exp((-2*pi*i*(k-1)*(n-1))/N);
%prev.step=>evaluating w-matrix
x(n)=w;
end
c(k,:)=x;
end
r=[c]*[x2']
%plotting magnitude and angle
subplot(211)
stem(abs(r));
title('DFT-absolute value');
subplot(212)
stem(angle(r));
title('DFT-angle'); OUTPUT WAVEFORM 
why we are using c=zeros(N)
ReplyDeleteThis comment has been removed by the author.
Deletejust to initialise the array by zero. we need it to create memory
Deletewhy we initialise array by zero and why create memory
Deleteto enter our values into it
DeleteKindly tell what to enter in the answer when it asks for "enter the sequence" and what is its function?
ReplyDeleteKindly if you can explain this program briefly. Waiting for your reply.
If you want a four point DFT, you will enter 4 values ,say, 2 3 4 6.
ReplyDeleteif I want to find DFT for square form
ReplyDeleteHow do I exchange
This comment has been removed by the author.
ReplyDeleteHow can I change the quantity of samples?
Delete