Subtraj

[jsw7460]

Description

Include a sub-trajectory sampling and refer to the example code provided in the documents.
The code is quite straightforward.

This is my first time for pull-requesting. If there are additional requirements or concerns, please inform me.
Additionally, I persistently encountered errors in sections unrelated to my code when attempting to run the code for Checklist 1, so I did not check it.

Fixes #134

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Screenshots

Please attach before and after screenshots of the change if applicable.
To upload images to a PR -- simply drag and drop or copy paste.

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have run pytest -v and no errors are present.
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I solved any possible warnings that pytest -v has generated that are related to my code to the best of my knowledge.
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[younik]

Closing for inactivity