matplotlib没有在条形图的x轴上显示第一个标签

时间:2017-04-28 06:43:09

标签: python matplotlib

以下是我正在编写的用于创建对数条形图的代码

import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure(figsize = (12,6))

ax = fig.add_subplot(111)

x = ['Blue Whale', 'Killer Whale', 'Bluefin tuna', \
     'Bottlenose dolphin', "Maui's dolphin", 'Flounder',\
     'Starfish', 'Spongebob Squarepants']

y = [190000, 5987, 684, 650, 40, 6.8, 5, 0.02]

ax.bar(np.arange(len(x)),y, log=1)

ax.set_xticklabels(x, rotation = 45)


fig.savefig(filename = "f:/plot.png")

现在这是创建条形图,其中没有显示第一个标签,即Blue Whale。这是我得到的情节enter image description here那么如何纠正呢? Matplotlib版本为2.0.0,Numpy版本为1.12.1

由于

3 个答案:

答案 0 :(得分:13)

在matplotlib 2.0中,轴的边缘可能有未示出的刻度线。为了安全起见,除了刻度标签外,您还可以设置刻度线位置

ax.set_xticks(np.arange(len(x)))
ax.set_xticklabels(x, rotation = 45)

如果标签旋转,您可能还需要将标签设置为与其右边缘对齐:

ax.set_xticklabels(x, rotation = 45, ha="right")

答案 1 :(得分:2)

是的,同意这有点奇怪。无论如何,这里有一个方法(只是在之前定义xticks)。

import matplotlib.pyplot as plt
import numpy as np

x = ['Blue Whale', 'Killer Whale', 'Bluefin tuna', \
     'Bottlenose dolphin', "Maui's dolphin", 'Flounder',\
     'Starfish', 'Spongebob Squarepants']

y = [190000, 5987, 684, 650, 40, 6.8, 5, 0.02]


fig = plt.figure(figsize = (12,6))
ax = fig.add_subplot(111)
ax.bar(np.arange(len(x)),y, log=1)
ax.set_xticks(np.arange(len(x)))
ax.set_xticklabels(x, rotation = 45, zorder=100)
fig.show()

enter image description here

答案 2 :(得分:1)

set_xticklabels()将设置显示的文本refer to this。 所以这样修改应该有效:

import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure(figsize = (12,6))

ax = fig.add_subplot(111)

x = ['Blue Whale', 'Killer Whale', 'Bluefin tuna', \
 'Bottlenose dolphin', "Maui's dolphin", 'Flounder',\
 'Starfish', 'Spongebob Squarepants']

y = [190000, 5987, 684, 650, 40, 6.8, 5, 0.02]

pos = np.arange(len(x))
ax.bar(pos,y, log=1)
ax.set_xticks(pos)
ax.set_xticklabels(x, rotation = 45)