In the following example, the box size is set to five data points. A FFT value or mean for any data point is calculated from itself and ‘the two data points on either side of it (if available).
Box size
The Box Size determines how many neighbouring data points are used in the smoothing calculation. The number of neighbouring data points can determined using time or a set number of points.
The Moving Average and the Fast Fourier algorithm use the Box Size parameter in different ways.
• The Moving Average function uses the Box Size to determine the window that is used to calculate the average for the new “smoothed” centre point.
• The FFT algorithm uses the Box Size to define the cut-off frequency that is then applied to all data.
In the following example, the box size is set to five data points. A FFT value or mean for any data point is calculated from itself and ‘the two data points on either side of it (if available).
To apply filtering and smoothing: