Question

If i have a list with tuples that reflects the position each time, and all I need is to have a graphic that shows this vectores as countour lines of the velocity (another list). How shoud I do it?

For example:

import matplotlib.pyplot as plt
import numpy as np
position = [(12,14), (12.22,13.22), (15, 17)]
velocity = [4.55,2.13,5]

Answer 1

Use griddata() to convert scatter points in to grid data, here is an example:

import numpy as np
from scipy.interpolate import griddata
import matplotlib.pyplot as plt
np.random.seed(0)

x = np.random.normal(size=200)
y = np.random.normal(size=200)
v = np.sqrt(x**2+y**2)

xg, yg = np.mgrid[x.min():x.max():100j, y.min():y.max():100j]
vg = griddata((x, y), v, (xg, yg), method='cubic')
plt.contourf(xg, yg, vg)
plt.scatter(x, y, c=v)
plt.show()

The output is: