Why are the results produced by fft2 and those produced by fft different?

I conducted Fourier transform on an imag through two operations:

Firstly:

pic='pic.jpg';
pic_read=rgb2gray(double(imread(pic)));
results1= fft2(pic_read);

Secondly:

for c=1:size(pic_read,2)
    fft_column(:,c)=fft(pic_read(:,c));
end
for r=1:size(pic_read,1) 
    results2(r,:)= fft(fft_column(r,:)); 
end
isequal(results1,results2)
ans =
     0

I want to know why the results of the two above operations are different ?

Thanks

Answer 1

[Ahmed raafat]

use tic toc commands

   tic
   ... your code...
   t=toc; % time in second
   freq=your images/t

[William]

Thank you. But are you sure that you answered the right question?

[Ahmed raafat]

I guess this is the only method to calculate the time