Question

7. The following values were measured at 1- metre intervals. Plot and apply simple 3-point and 5-point filters. What are the maximum and minimum values of the unfiltered and two filtered data sets? What are the most obvious wavelengths in each case? –3, 2, 1, 4, 0, 4, –1, 3, 0, 1, –4, 0, –4, –1, –4, 1, 0, 2, 4.

Answer 1

Maxima and minima are+ 4,-4; 2.67,-3; 2.2, -2.6, respectively.

The first and most noticeable wavelengths are 2 m and around 15 m however the 3-and 5-point filters gradually decrease the amplitude of the 2-m wave-length.