The Fourier Analysis function calculates the short term, medium term and the longer term trends in a wave formation of a security. 

Fourier Analysis is used to detect cyclical patterns within price movements. This function is widely used in general engineering and can be applied to the stock market.  Fourier analysis can be used to extract dominant cycles from any data series (e.g. price or an indicator). The general principle is that you can approximate any finite time series by breaking the data down into a set of harmonic sine waves of differing pitch.