如何使用非有序值制作第二个 python x 轴？

Question

我想让 axes2 轴按照它们在向量中的方式显示距离向量的值，而不是像默认情况下那样越来越有序。我该怎么做？

代码：

from numpy import linspace
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import matplotlib.axes
import math


distance = [6, 56, 106, 156, 207, 257, 309, 257, 206, 154, 103, 52, 
            103, 153, 204, 254, 304, 354, 303, 252, 201, 150, 99, 47, 
            98, 149, 199, 249, 300, 350, 299, 248, 196, 145, 94, 42]

t = linspace(0, 6, 3291) 
t1 = linspace(0, 6, 2104)


plt.plot(t, local, "g", label="LOCAL")
plt.plot(t1, cpm, "r", label="CPM")
plt.legend(loc="upper left")
plt.fill_between(t, 0, local, facecolor='green', interpolate=True)
plt.fill_between(t1, 0, cpm, facecolor='red', interpolate=False)

axes1 = plt.gca()
axes2 = axes1.twiny()
axes2.set_xticks(distance, minor=False)

plt.title("Object detection")
plt.xlabel("Time in Minutes")
plt.ylabel("Number of objects")
plt.show()

Answer 1

要在轴上放置所需的值，请使用定位器和格式化程序来放置它们。可以在官方参考中找到here and here

from numpy import linspace
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import matplotlib.axes
import math
import matplotlib.ticker as ticker

np.random.seed(20210210)
local = np.random.randint(0, 20, size=3291)
cpm = np.random.randint(0, 10, size=2104)

distance = [6, 56, 106, 156, 207, 257, 309, 257, 206, 154, 103, 52, 
            103, 153, 204, 254, 304, 354, 303, 252, 201, 150, 99, 47, 
            98, 149, 199, 249, 300, 350, 299, 248, 196, 145, 94, 42]
dis = [str(s) for s in distance]
pos = np.arange(0,len(dis))

t = linspace(0, 6, 3291) 
t1 = linspace(0, 6, 2104)

plt.figure(figsize=(12,9))
plt.plot(t, local, "g", label="LOCAL")
plt.plot(t1, cpm, "r", label="CPM")
plt.legend(loc="upper left")
plt.fill_between(t, 0, local, facecolor='green', interpolate=True)
plt.fill_between(t1, 0, cpm, facecolor='red', interpolate=False)

axes1 = plt.gca()
axes2 = axes1.twiny()
# axes2.set_xticks(distance, minor=False)
axes2.xaxis.set_major_locator(ticker.FixedLocator(pos))
axes2.xaxis.set_major_formatter(ticker.FixedFormatter(dis))
axes2.set_xlim(0,len(dis))

plt.title("Object detection")
plt.xlabel("Time in Minutes")
plt.ylabel("Number of objects")
plt.show()

如何使用非有序值制作第二个 python x 轴？

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