How do I add a Hanning Window to this code before I FFT it?

Hi,

I've heard adding a Hanning Window can help with data processing before you apply a Fourier Transform. With the code I have below, where can I add such a window?

Any help would be greatly appreciated.

a=dlmread('Ethanol_05273.txt');
alex_x=a(873:2048,1)/1000;
alex_y=a(873:2048,2);
plot(alex_x,alex_y); grid on;
alex_x_f=10000./alex_x;
F=linspace(min(alex_x_f),max(alex_x_f),1024);
alex_y_f=interp1(10000./alex_x,alex_y,F,'pchip');
FT=fft(alex_y_f);
figure;
plot(abs(FT));

Answer 1

[dpb]

FT=fft(hanning(length(alex_y_f)).*alex_y_f);

presuming your data are vectors. If not, use the proper array dimension for length() of window, of course.

See

doc hanning  % details on windowing

Answer 2

[Paul Clarkson]

Thank you!

Answer 3

[Shivam Bahuguna]

How to take care of the window ccorrection factor while doing this?