CodexBloom - Programming Q&A Platform

implementing animated Matplotlib plots when updating data in real-time

πŸ‘€ Views: 1417 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-13
matplotlib animation real-time Python

I keep running into I'm not sure how to approach I've hit a wall trying to I'm working on a project and hit a roadblock. I'm collaborating on a project where I've been struggling with this for a few days now and could really use some help. Quick question that's been bugging me - I'm trying to create a real-time animated plot using Matplotlib's `FuncAnimation` to visualize data from a sensor that updates every second. However, I'm running into a question where the plot does not seem to update consistently. I expected the plot to reflect the new data points as they come in, but instead, it either freezes or displays the old data. Here’s a simplified version of my code: ```python import numpy as np import matplotlib.pyplot as plt from matplotlib.animation import FuncAnimation # Simulated data generator def get_sensor_data(): return np.random.rand() * 100 x_data = [] y_data = [] fig, ax = plt.subplots() line, = ax.plot(x_data, y_data) ax.set_ylim(0, 100) ax.set_xlim(0, 10) # Animation function def update(frame): x_data.append(frame) y_data.append(get_sensor_data()) line.set_data(x_data, y_data) if frame >= 10: ax.set_xlim(frame - 10, frame) return line, ani = FuncAnimation(fig, update, frames=np.arange(0, 100), blit=True, interval=1000) plt.show() ``` I have tried tweaking the `blit` parameter, thinking it might help with performance, but that doesn't seem to change anything. I also noticed that when I run the code, sometimes I get a warning about the `set_data` method not being able to update the data correctly if the lengths of `x_data` and `y_data` are not equal. As the loop continues, it seems to accumulate data, yet the visualization doesn't update accordingly. Can anyone guide to understand why the plot isn't updating as expected in real-time, and what I might be able to do to fix it? I'm using Matplotlib version 3.6.0 with Python 3.10.0. For context: I'm using Python on Windows. I'm working on a API that needs to handle this. Thanks in advance! What are your experiences with this? Am I missing something obvious? I'd really appreciate any guidance on this. I'm working with Python in a Docker container on Windows 11. Any help would be greatly appreciated!