Need help troubleshooting MatLab error

I need help troubleshooting this error message,

Matrix dimensions must agree.

Error in myExperimentThreeLab6 (line 38) Error1 = y ./ x2;

 function myExperimentThreeLab6(~)              

load handel.mat y; 
%sound(y,8192);

% Experiment Three 

subplot(4,1,1);
stem(y(100:18000));
title('Original Signal');

% A)

x1 = fft(y,10000);
x2 = ifft(x1,10000);
subplot(4,1,2);
stem(x2);
title('Signal at 10,000');

% B)

x3 = fft(y,16000);
x4 = ifft(x3,16000);
subplot(4,1,3);
stem(x4);
title('Signal at 16,000');

% C)

x5 = fft(y,17901);
x6 = ifft(x5,17901);
subplot(4,1,4);
stem(x6);
title('Signal aat 17,901');

% Experiment Four 

Error1 = y ./ x2; 
Error2 = y ./ x4; 
Error3 = y ./ x6; 

fprintf('Errror at 10,000 = %f \n ', Error1);
fprintf('Errror at 16000 = %f \n ', Error2);
fprintf('Errror at 10,000 = %f \n ', Error3);

end

Answer 1

[Image Analyst]

y is 73113 elements long while x2 is 10000 elements long. How/why do you expect that to work???

[Austin Gaylor]

how would I index the array so I have the same dimensions?

[Image Analyst]

You could use interp1(), but you really need to understand what you want to do, because that's not really the right thing to do. It's just a bandaid patch to the problem that doesn't fix the real problem

[Austin Gaylor]

Okay, thank you. What I am trying to do is use fft() and ifft() to find the Fourier Transform oh handel.mat, then reconstruct the signal at different approximation terms. That is were the 10000, 16000, 17901 came from.