Python中的 Matplotlib.axes.Axes.set_ylabel()
Matplotlib是Python中的一个库,它是 NumPy 库的数值数学扩展。 Axes 类包含大部分图形元素:Axis、Tick、Line2D、Text、Polygon 等,并设置坐标系。 Axes 的实例通过回调属性支持回调。
matplotlib.axes.Axes.set_ylabel()函数
matplotlib 库的 axes 模块中的Axes.set_ylabel()函数用于设置 y 轴的标签。
Syntax: Axes.set_ylabel(self, xlabel, fontdict=None, labelpad=None, **kwargs)
Parameters: This method accepts the following parameters.
- ylabel : This parameter is the label text.
- labelpad : This parameter is the spacing in points from the axes bounding box including ticks and tick labels.
Returns:This method does not returns any value.
下面的示例说明了 matplotlib.axes 中的 matplotlib.axes.Axes.set_ylabel()函数:
示例 1:
import matplotlib.pyplot as plt
import numpy as np
t = np.arange(0.01, 5.0, 0.01)
s = np.exp(-t)
fig, ax = plt.subplots()
ax.plot(t, s)
ax.set_ylim(1, 0)
ax.set_ylabel('Display Y-axis Label',
fontweight ='bold')
ax.grid(True)
ax.set_title('matplotlib.axes.Axes.set_ylabel() \
Examples\n', fontsize = 14, fontweight ='bold')
plt.show()
输出:
示例 2:
#Implementation of matplotlib function
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.cbook as cbook
with cbook.get_sample_data('goog.npz') as datafile:
price_data = np.load(datafile)['price_data'].view(np.recarray)
# get the most recent 250
# trading days
price_data = price_data[-250:]
delta1 = np.diff(price_data.adj_close) / price_data.adj_close[:-1]
volume = (25 * price_data.volume[:-2] / price_data.volume[0])**(2.2)
close = (0.03 * price_data.close[:-2] / 0.03 * price_data.open[:-2])**2
fig, ax = plt.subplots()
ax.scatter(delta1[:-1], delta1[1:],
c=close, s=volume,
alpha=0.5)
ax.set_ylabel(r'Y-axis contains $\Delta_{i+1}$ values',
fontweight='bold')
ax.grid(True)
fig.suptitle('matplotlib.axes.Axes.set_ylabel() Examples\n',
fontsize=14, fontweight='bold')
plt.show()
输出: