plt.contour in Python

Question

I would like to make a 2D contour plot given 3 numpy arrays of same size X Y Z with (X,Y) the coordinates and Z the value at (X,Y).

Now, the function plt.contour seems to work only with a grid, and values at the intersection of the grid, and takes as input a rectangular grid only with 2D matrices as input.

see http://matplotlib.org/examples/pylab_examples/contour_demo.html

If the input for that function is (XX,YY,ZZ) then XX is a 2D rectangular array where every line is the same and every column is constant, while YY is a 2D rectangular array where every column is the same, and every line is constant.

Now, what function should I use, or what procedure should I follow, if I want to make the contour plot when the input values are NOT values taken on a grid?

thanks

Serenity · Accepted Answer · 2016-06-05 08:41:31Z

1

Try to use plt.tricontour: http://matplotlib.org/api/pyplot_api.html?highlight=tricontour#matplotlib.pyplot.tricontour

It draws contours on an unstructured triangular grid.

Little example:

import numpy as np
import matplotlib.pyplot as plt
x = np.random.rand(100)
y = np.random.rand(100)
z = x**2+np.sin(y)*y
f, ax = plt.subplots(1,1)
ax.tricontour(x,y,z)
ax.plot(x,y, 'r. ')
plt.show()

answered Jun 5, 2016 at 8:41

Serenity

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