[英]How to plot two level x-axis labels for a histogram?
Is there a way to do the same of this two x-axis labels but for a histogram plot? 有没有办法对这两个x轴标签做同样的事情,但对于直方图? How to add second x-axis at the bottom of the first one in matplotlib.?
如何在matplotlib的第一个底部添加第二个x轴。
I want to show the values in two levels, one for metric and the second for English units. 我想以两个级别显示值,一个用于公制,第二个用于英制单位。 I tried to adapt the script in the link above to a histogram script but I'm not sure how to connect the histogram function with the ax1.
我试图将上面链接中的脚本调整为直方图脚本,但我不确定如何将直方图函数与ax1连接。 handle.
处理。
"""
Demo of the histogram (hist) function with a few features.
In addition to the basic histogram, this demo shows a few optional features:
* Setting the number of data bins
* The ``normed`` flag, which normalizes bin heights so that the integral of
the histogram is 1. The resulting histogram is a probability density.
* Setting the face color of the bars
* Setting the opacity (alpha value).
"""
import numpy as np
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt
fig = plt.figure()
ax1 = fig.add_subplot(111)
ax2 = ax1.twiny()
# example data
mu = 100 # mean of distribution
sigma = 15 # standard deviation of distribution
x = mu + sigma * np.random.randn(10000)
num_bins = 50
# the histogram of the data
n, bins, patches = plt.hist(x, num_bins, normed=1, facecolor='green', alpha=0.5)
ax1.set_xlabel(r"Original x-axis: $X$")
new_tick_locations = np.array([.2, .5, .9])
def tick_function(X):
V = 1/(1+X)
return ["%.3f" % z for z in V]
# Move twinned axis ticks and label from top to bottom
ax2.xaxis.set_ticks_position("bottom")
ax2.xaxis.set_label_position("bottom")
# Offset the twin axis below the host
ax2.spines["bottom"].set_position(("axes", -0.15))
# Turn on the frame for the twin axis, but then hide all
# but the bottom spine
ax2.set_frame_on(True)
ax2.patch.set_visible(False)
for sp in ax2.spines.itervalues():
sp.set_visible(False)
ax2.spines["bottom"].set_visible(True)
ax2.set_xticks(new_tick_locations)
ax2.set_xticklabels(tick_function(new_tick_locations))
ax2.set_xlabel(r"Modified x-axis: $1/(1+X)$")
y = mlab.normpdf(bins, mu, sigma)
plt.xlabel('Smarts')
plt.ylabel('Probability')
plt.title(r'Histogram of IQ: $\mu=100$, $\sigma=15$')
# Tweak spacing to prevent clipping of ylabel
plt.subplots_adjust(left=0.15)
plt.show()
just replace your hist
call by: 只需将你的
hist
调用替换为:
n, bins, patches = ax1.hist(x, num_bins, normed=1, facecolor='green', alpha=0.5)
Check the documentation for Axes
to see what member functions are available 查看
Axes
的文档以查看可用的成员函数
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