填充 3D 線圖下方

示範如何建立填充線圖下方空間的多邊形。在此範例中，多邊形是半透明的，產生一種「鋸齒狀彩色玻璃」效果。

import math

import matplotlib.pyplot as plt
import numpy as np

gamma = np.vectorize(math.gamma)
N = 31
x = np.linspace(0., 10., N)
lambdas = range(1, 9)

ax = plt.figure().add_subplot(projection='3d')

facecolors = plt.colormaps['viridis_r'](np.linspace(0, 1, len(lambdas)))

for i, l in enumerate(lambdas):
    # Note fill_between can take coordinates as length N vectors, or scalars
    ax.fill_between(x, l, l**x * np.exp(-l) / gamma(x + 1),
                    x, l, 0,
                    facecolors=facecolors[i], alpha=.7)

ax.set(xlim=(0, 10), ylim=(1, 9), zlim=(0, 0.35),
       xlabel='x', ylabel=r'$\lambda$', zlabel='probability')

plt.show()

標籤：繪圖類型：3D 繪圖類型：fill_between 程度：初學者