Matplotlib.axis.axis.set_major_formatter()

matplotlib库的Axis模块中的Axis.set_major_formatter()函数用于设置主标记的格式化器。

语法:Axis.set_major_formatter(self, formatter)

参数:该方法接受以下参数。

formatter:该参数是 格式化程序 .

返回值:该方法不返回任何值。

下面的例子说明了matplotlib.axis.axis.set_major_formatter()函数在matplotlib.axis中的作用:

示例1

# Implementation of matplotlib function 
import numpy as np
from matplotlib.axis import Axis  
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker
     
np.random.seed(19680801)
  
fig, ax = plt.subplots()
ax.plot(100*np.random.rand(20))
  
formatter = ticker.FormatStrFormatter('?%1.2f')
Axis.set_major_formatter(ax.yaxis, formatter)
  
for tick in ax.yaxis.get_major_ticks():
    tick.label1.set_color('green')
  
plt.title("Matplotlib.axis.Axis.set_major_formatter()\n\
Function Example", fontsize = 12, fontweight ='bold') 
  
plt.show()

输出:

Matplotlib.axis.axis.set_major_formatter()

示例2

# Implementation of matplotlib function 
from matplotlib.axis import Axis
import datetime 
import matplotlib.pyplot as plt 
from matplotlib.dates import DayLocator, HourLocator, DateFormatter, drange 
import numpy as np 
      
date1 = datetime.datetime(2020, 4, 2) 
date2 = datetime.datetime(2020, 4, 6) 
delta = datetime.timedelta(hours = 6) 
dates = drange(date1, date2, delta) 
      
y = np.arange(len(dates)) 
      
fig, ax = plt.subplots() 
ax.plot_date(dates, y ** 2, 'g') 
      
ax.set_xlim(dates[0], dates[-1]) 
      
ax.xaxis.set_major_locator(DayLocator()) 
ax.xaxis.set_minor_locator(HourLocator(range(0, 25, 6))) 
ax.xaxis.set_major_formatter(plt.NullFormatter()) 
      
ax.fmt_xdata = DateFormatter('% Y-% m-% d % H:% M:% S') 
fig.autofmt_xdate() 
   
plt.title("Matplotlib.axis.Axis.set_major_formatter()\n\
Function Example", fontsize = 12, fontweight ='bold') 
  
plt.show()