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[task #15578] Function to find if polygon vertices are sorted anti-clock

From: Sachin Kumar Singh
Subject: [task #15578] Function to find if polygon vertices are sorted anti-clockwise
Date: Thu, 26 Mar 2020 14:12:19 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:73.0) Gecko/20100101 Firefox/73.0

Follow-up Comment #12, task #15578 (project gnuastro):

The required changes are made and pushed here
<>. The
document is not changed yet. 

About comment #7, yes, I'd seen that wiki page prior to the elements 84's
article. The orientation matrix as shown in the wiki is just twice the matrix
used in calculating the area of a polygon by the shoelace formula
<>. And indeed this is what the
84's article was all about, checking the area of the polygon to find the
orientation. Hence both these are fundamentally similar.


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