Plot surface graph with 3 lists

Question

How can I plot a surface graph with Matplotlib (python), if I only have 3 lists (X, Y, Z)? I would also like to interpolate the rest of the values so that the graph area is completely filled. I've tried through similar answers found here, however, without success.

X = [925, 875, 840, 800, 775, 726, 689, 650, 626] #*seconds spent - dependent variable*

Y = [0.9960, 0.9680, 0.9600, 0.9540, 0.9525, 0.9510, 0.9420, 0.9365, 0.9300] #*accuracy - dependent variable*

Z = [600, 575, 550, 525, 500, 475, 450, 425, 400] #*size of dataset - the independent variable.*

I tried to use this:

from mpl_toolkits.mplot3d import Axes3D
import numpy as np
import matplotlib.pyplot as plt
from scipy.interpolate import Rbf


x = [925, 875, 840, 800, 775, 726, 689, 650, 626]
y = [0.9960, 0.9680, 0.9600, 0.9540, 0.9525, 0.9510, 0.9420, 0.9365, 0.9300]
z = [600, 575, 550, 525, 500, 475, 450, 425, 400]

xnew = np.asarray(x)
ynew = np.asarray(y)
znew = np.asarray(z)

xi,yi = np.meshgrid(np.linspace(xnew.min(), xnew.max(), 10), np.linspace(ynew.min(), ynew.max(), 10))
    
rbf = Rbf(xnew, ynew, znew, funtion='cubic')
zi = rbf(xi, yi)

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.plot_surface(xi,yi,zi,cstride=1,rstride=1,cmap='viridis')

And I obtained something like this (not the fully filled surface):

I know that I need to interpolate, but it's not working.

Surface plot

Show what you've done so far, so we can start there and work with that. Also what similar answers have you tried? — David Collins, Sep 20 '20 at 18:45
I tried procedures like in: https://stackoverflow.com/questions/35259285/plotting-three-lists-as-a-surface-plot-in-python-using-mplot3d — Vinícius Wittig Vianna, Sep 20 '20 at 21:08

score 0 · Answer 1 · answered Sep 20 '20 at 15:15

0

Following Matplotlib's Gallery, you can use ax.plot_surface to plot a 3d surface using matplotlib. Just follow the example in the link.

See also the question here: surface plots in matplotlib. Which is the same solution as in the example above.

answered Sep 20 '20 at 15:15

Roim

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Thanks for your attentiton! I already saw this documents, but I need something less sophisticated, principaly, because I have only three lists (I don't have any functions from the data relationship). Can you help me, please? – Vinícius Wittig Vianna Sep 26 '20 at 14:09

Plot surface graph with 3 lists

1 Answers1