如何在matplotlib和python 2.7中製作瀑布圖？

Question

怎樣做圖喜歡這裏

http://38.media.tumblr.com/tumblr_m7bk6wu3VW1qfjvexo1_500.gif

看到我不需要動態。我確實需要前景曲線模糊背景曲線。

這些用於脈衝星天文學。

我已經嘗試了

plt.fill（）和

plt.fill_between（）

沒有成功。有人知道python的某個地方有沒有例子？

Answer 1

您可以通過小心與線條的z順序和fill_under創建像預期的效果：

import numpy as np 
import matplotlib.pyplot as plt 

fig = plt.figure(facecolor='k') 
ax = fig.add_subplot(111, axisbg='k') 

def fG(x, x0, sigma, A): 
    """ A simple (un-normalized) Gaussian shape with amplitude A. """ 
    return A * np.exp(-((x-x0)/sigma)**2) 

# Draw ny lines with ng Gaussians each, on an x-axis with nx points 
nx, ny, ng = 1000, 20, 4 
x = np.linspace(0,1,1000) 

y = np.zeros((ny, nx)) 
for iy in range(ny): 
    for ig in range(ng): 
     # Select the amplitude and position of the Gaussians randomly 
     x0 = np.random.random() 
     A = np.random.random()*10 
     sigma = 0.05 
     y[iy,:] += fG(x, x0, sigma, A) 
    # Offset each line by this amount: we want the first lines plotted 
    # at the top of the chart and to work our way down 
    offset = (ny-iy)*5 
    # Plot the line and fill under it: increase the z-order each time 
    # so that lower lines and their fills are plotted over higher ones 
    ax.plot(x,y[iy]+offset, 'w', lw=2, zorder=(iy+1)*2) 
    ax.fill_between(x, y[iy]+offset, offset, facecolor='k', lw=0, zorder=(iy+1)*2-1) 
plt.show()