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[Octave-bug-tracker] [bug #39370] contourc adds duplicates to the start

From: Nicholas Jankowski
Subject: [Octave-bug-tracker] [bug #39370] contourc adds duplicates to the start and end of the 1st level
Date: Tue, 26 Jul 2022 10:57:34 -0400 (EDT)

Follow-up Comment #13, bug #39370 (project octave):

looking again at matlab's old documentation, they had a 'contour algorithm'

"Keep checking the edges of each square entered to determine the exit edge
until the line(cx,cy) closes on its initial point or exits the grid."


Wouldn't surprise me if there was an explicit 'if within eps, make the points
exact' step in their algorithm. that would likely help merge
intersecting/branching contours, but now that I try to think about it I'm not
sure if continuous functions can have branches/intersections.


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