No module named matplotlib

To resolve the issue "No module named matplotlib," you to install the `matplotlib` module. You can do this by running the following command in your terminal:

pip install matplotlib

Make sure you have `pip` installed on your system. If you don't have it, you can install it using `python -m ensurepip --upgrade`. Once the installation is complete, you should be able to import and use the `matplotlib` module in your code without any errors.