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I am currently working on a multi line graph, however I can't figure out how to label data point on my graph. I have tried to annotate it but somehow my code doesn't work. Any advice please?

import numpy as np
import matplotlib.pyplot as plt

data={'Time':['Start','1W','2W','3W','1M','2M','3M','6M','8M'],
      '40℃':[30,50,60,50,55,None,56,67,75],
      '25℃':[30,None,None,None,35,43,None,53,67]}

df=pd.DataFrame(data,columns=['Time','40℃','25℃'])
print(df) 

# Change the style of plot
plt.style.use('seaborn-darkgrid')

# set figure size
my_dpi=96
plt.figure(figsize=(800/my_dpi, 600/my_dpi), dpi=my_dpi)

# plot multiple lines
xs=np.arange(9)
series1=np.array(data['40℃']).astype(np.double)
s1mask = np.isfinite(series1)
series2 = np.array(data['25℃']).astype(np.double)
s2mask = np.isfinite(series2)
 
plt.plot(xs[s1mask], series1[s1mask],  marker='o', markersize=5,linewidth=1, alpha=0.6)
plt.plot(xs[s2mask], series2[s2mask],  marker='o', markersize=5,linewidth=1, alpha=0.6)


             
# Change x axis limit
plt.xlim(-0.5,8.5)
plt.ylim(25,80)


# Add titles
plt.title("Viscosity", loc='center', fontsize=12, fontweight=0, color='black')
plt.xlabel("Time",fontsize=12)
plt.ylabel("Temperature(°C)",fontsize=12)

# Adjust tick of y-axis
plt.yticks(np.arange(25,80,5))

# Show the graph
plt.show()

my graph

Trenton McKinney
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  • This is not a good way to plot discrete data. The lines imply a nonexistent linear relationship. The data should be plotted as a barplot `p1 = df.plot(kind='bar', x='Time', rot=0, ylabel='Temperature(°C)', title='Viscosity')` and then annotate with [How to plot and annotate a grouped bar chart](https://stackoverflow.com/q/63493530/7758804) – Trenton McKinney Aug 17 '21 at 03:51

0 Answers0