Add a Legend to the Plot
Description:
This program plots a simple line graph and adds a legend to identify each line. The legend helps in distinguishing the different lines in the chart, making it easier to understand what each line represents.
Explanation:
-
legend()function is used to label lines or bars in a chart. -
It helps users identify what each color or line stands for.
-
Each plotted line or bar should have a
labelparameter. -
Useful for comparing multiple data series visually.
Program:
import matplotlib.pyplot as plt
# Sample data for 3 lines
x = [1, 2, 3, 4, 5]
y1 = [10, 20, 25, 30, 40] # Line 1
y2 = [5, 15, 20, 25, 35] # Line 2
y3 = [2, 10, 15, 20, 25] # Line 3
# Plotting the lines
plt.plot(x, y1, label='Line 1', color='blue', marker='o')
plt.plot(x, y2, label='Line 2', color='green', linestyle='--')
plt.plot(x, y3, label='Line 3', color='red', linestyle=':')
# Adding titles and labels
plt.title('Multiple Lines on Same Chart')
plt.xlabel('X-axis')
plt.ylabel('Y-axis')
# Add a legend
plt.legend()
# Show grid
plt.grid(True)
# Show the plot
plt.show()
Output:
