I'm working on Ornstein Zernike Equation, to study the effective interactions between charged model colloids. To calculate the structure factor for colloids I wanted to use fourier transforms.
fs=XXXX; %the sample frequency
N=XXXX; %the sample points
n=0:N-1;
t=n/fs;
f0=100; %signal frequency
x=sin(2*pi*f0*t);
y=abs(fft(x,N)); %FFT converse spectrum
plot(y);
You mean FFT code? Have a look at
http://au.mathworks.com/help/matlab/math/fast-fourier-transform-fft.html
If you want to Find DFT you can use example in the link below:
http://matlabgeeks.com/tips-tutorials/how-to-do-a-fourier-transform-in-matlab/
If your signal is x. Then you can find its Fourier transform simply doing X = fft(x);
If your signal x is a sine wave, then you will only get a peak at the frequency of the oscillation, with a bit of spread around this value.
Thank you all for your suggestions....
I am looking for discrete fast sin transform and inverse of it without in-built functions in matlab.
for direct fast Fourrier transform of a fonction v, use the command v_hat = fft(v)n for inverse fft use the command : v=ifft(v_hat)). I hope this brief answer will be sufficient.
Best regards.
A quick google search revealed the web page attached.
http://people.sc.fsu.edu/~jburkardt/m_src/sine_transform/sine_transform.html
Thank you Slim Kaddeche.. I am not looking for in-built functions of sin transform.
https://www.mathworks.com/help/signal/ug/power-spectral-density-estimates-using-fft.html
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