Mathematical execution of contourc

How does contourc command filters the same contour levels? Is it possible to execute that function without any quick command? What is the mathematical expression that contourc executes? Thanks.

[Stephen23]

Duplicate:

https://www.mathworks.com/matlabcentral/answers/2046987-understanding-the-working-mechanism-of-contourc

Answer 1

[Matt J]

The documentation doesn't disclose it, but I would guess that it does a kind of 2D bisection algorithm. Sample points are chosen near where Z=level and the area covered by the samples is iteratively contracted to make abs(Z-level) smaller and smaller.