solveWaveFFT

Performs fast fourier transform on wave elevation time-series and outputs dominant frequencies & corrosponding power spectrum values.

Note: Description accessible with Matlab's built-in "help" function.

The function solveWaveFFT(eta,Fs,units,peaks) computes and plots the 1-sided spectrum from the fast fourier transform of a given time series signal (eta). This function utilizes Matlab's built-in fft function.

Inputs:

1. eta – wave elevation time series
2. Fs – sampling frequency
3. Units – toggle (1: Hz | 2: rads/s)
4. Peaks – number of peaks of interest from transform

Outputs:

1. Ap – amplitude of peaks
2. fp – frequency value of transform peaks, in units specified by input 3.