How to Specify the Number of Y-Axis Points in Matplotlib and Extract Them

Learn how to easily specify the number of points on the `y-axis` in Matplotlib, and discover how to extract these values for further analysis.
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How to Specify the Number of Y-Axis Points in Matplotlib and Extract Them

When working with data visualization in Python, especially while using libraries such as Matplotlib, you may encounter situations where you want to fine-tune your graphs. One common issue is needing to specify the number of points on the y-axis of your plot. In this guide, we'll walk through how to adjust the number of axis points in Matplotlib while also extracting those values for further usage.

The Problem

You might find yourself running a script that generates a graph using random data points created via a random walk. In the original setup, you may notice that the y-axis only displays a limited number of points. For instance, you might see just 5 points on the y-axis, although you'd like to have 20 displayed instead. Similarly, it may be useful to capture these points for additional analysis or processing.

In this example, you wish to modify the existing code to expand the y-axis points and extract them into an array.

The Solution

Let's break down the solution into steps, detailing how to achieve your desired results using Matplotlib.

Step 1: Modify Plot to Display More Y-Axis Points

To increase the number of ticks on the y-axis, you can utilize the locator_params() function. Here's how you can implement it:

[[See Video to Reveal this Text or Code Snippet]]

Key Points:

plt.locator_params(axis='y', nbins=20): Increases the number of ticks on the y-axis to 20. You can similarly adjust the x-axis if needed.

Step 2: Extract Y-Axis Values

After setting number of ticks, if you want to retrieve these y-axis values, the following code snippet will help you do just that.

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

Creating a subplot with fig, ax = plt.subplots() allows for more manipulation.

The ax.get_yticks() function retrieves the current ticks along the y-axis, giving you an array of values which can be utilized in further analysis or reporting.

Conclusion

By following the steps outlined above, you can now easily specify the number of points on the y-axis when generating plots in Matplotlib and extract these points into a usable format. This simple yet powerful method can significantly enhance the clarity and usability of your data visualizations.

Feel free to adjust the number of ticks according to your needs, and make sure to leverage the extracted values for any further analyses you may be performing.

Happy plotting!

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