How to Customize Y-Axis Limits in Matplotlib Plots?

Customizing Y-Axis Limits in Matplotlib

In matplotlib, customizing the axis limits is crucial for presenting data effectively. This question addresses the need to set the y-axis limits for a specific plot, where the provided code fails to achieve the desired limits.

To address this issue, we can use the following approach:

1. Access the current axis using plt.gca():

ax = plt.gca()

2. Set the y-axis limits using set_ylim():

ax.set_ylim([ymin, ymax])

In the example provided in the question, the code can be modified as follows:

import matplotlib.pyplot as plt

plt.figure(1, figsize = (8.5,11))
plt.suptitle('plot title')
ax = []
aPlot = plt.subplot(321, axisbg = 'w', title = "Year 1")
ax.append(aPlot)
plt.plot(paramValues,plotDataPrice[0], color = '#340B8C',
     marker = 'o', ms = 5, mfc = '#EB1717')
plt.xticks(paramValues)
plt.ylabel('Average Price')
plt.xlabel('Mark-up')
plt.grid(True)

# Set y-axis limits
ax = plt.gca()
ax.set_ylim([20, 250])

With this adjustment, the y-axis limits will be set to [20, 250], as desired.

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