In Python, can Matplotlib's Contour function return the points of a particular contour line?

Question

I had to use contour plots to generate plots of a set of inconveniently defined hyperbolic functions. This works and it plots a series of them with some noise added (it's a passive RF geolocation TDOA problem for those who are familiar with such things).

Since my python program knows the (x,y) of the target, I want to sample all the different hyperbolas that I'm drawing around that point and generate an error ellipse. If I can get the Matplotlib contour function to return the points of each contour line as it is drawn, I can handle the rest of the calculations. So...

Can the Matplotlib contour function return all of the (x,y) values for a particular contour line, say at f(x,y)=0?

Community · Accepted Answer · 2017-05-23 11:54:31Z

7

You can draw a contour at a specific level like this:

c = plt.contour(X, Y, Z, [level])

Now you can extract the contour points from the returned object c (see this answer):

v = c.collections[0].get_paths()[0].vertices
x = v[:,0]
y = v[:,1]

edited May 23, 2017 at 11:54

CommunityBot

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answered Aug 8, 2014 at 16:48

Falko

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