Show text for particular points of line chart in matplotlib-CodePudding

I need to show text for points that have only the maximum and minimum values so I can avoid text overlapping as shown in the image.

Here is the code

x = df['Measurement Date']
y = df['SYS']
  
plt.plot(x, y)

plt.rcParams['figure.figsize'] = (15, 10)

for x, y in zip(df['Measurement Date'], df['SYS']):
    plt.text(x = x, y = y, s = '{:.0f}'.format(y))

plt.show()

CodePudding user response：

This can be achieved by looping through the data frame with the minimum and maximum values extracted from the data frame.

import pandas as pd
import matplotlib.pyplot as plt

df = pd.read_csv('./data/bp_log.csv')
min_max = df[(df['SYS'] == df['SYS'].min()) | (df['SYS'] == df['SYS'].max())] 
x = df['Measurement Date']
y = df['SYS']
  
plt.plot(x, y)

plt.rcParams['figure.figsize'] = (15, 10)

#for x, y in zip(df['Measurement Date'], df['SYS']):
for x, y in zip(min_max['Measurement Date'], min_max['SYS']):
    plt.text(x = x, y = y, s = '{:.0f}'.format(y))

plt.show()