Error in the NGTDM docs

[sgdy3]

I've found a littel error in the doc of NGTDM featurs. The shown example of NGTDM is like this: $$\begin{split}\begin{array}{cccc} i & n_i & p_i & s_i\ \hline 1 & 6 & 0.375 & 13.35\ 2 & 2 & 0.125 & 2.00\ 3 & 4 & 0.25 & 2.63\ 4 & 0 & 0.00 & 0.00\ 5 & 4 & 0.25 & 10.075 \end{array}\end{split}$$ But as formular caculated in the page below, $s_3$ should be equal to 3.03. $s_3 = |3-12/5| + |3-18/5| + |3-20/8| + |3-5/3| = 3.03$ I've read this doc from Neighbouring Gray Tone Difference Matrix (NGTDM) Features

PS.I'm new in github, not familiar with the proper format to submmit an issue. If there exist any inappropriate, pleas forgive my rudeness.

[JoostJM]

Thanks for the issue @sgdy3, it does look like a typo indeed. I'll take a look and push a fix.