IDFT in MATLAB

Just create a new file with extension .m and paste the code below in that .m file. Then Run it.

clc;

clear all;

x=input('Enter the sequence X(k) : ');

N=input('\nEnter the value of no. of points N : ');

L=length(x);

if(N>=L)

    x=[x zeros(1,N-L)];

elseif(N<L)

  error('Length of sequence must be less than no. of points.\n');

end

for n=0:1:N-1

    IDFT(n+1)=0;

    for k=0:1:N-1

        IDFT(n+1)=IDFT(n+1)+(1/N)*x(k+1)*exp(2*pi*j*k*n/N);     

    end    

end  

fprintf('IDFT of X(k) is x(k). Then ')

IDFT