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Basically I have some Terahertz time-domain-spectroscopy which I'm trying to analyse.

The data that I have has Voltage and "Delay length" within the array.

Apparently I can convert the delay length to a time using t=(delay length)/c. Then I can do a fast fourier transform in MATLAB to swap things to the frequency domain.

The column with the voltage data I have is called 'V' and I just fft(V); however, the data Iget out is strange. My final plot should be amplitude on the y afis and frequency along the x axis.

Has anyone done anything like this before? Am I supposed to use both vectors in the array to do the transform?

Best wishes