ENH: Monte Carlo Formatting Options (#945)

[khushalkottaru]

Pull request type

• Code changes (bugfix, features)

Checklist

• Tests for the changes have been added (if needed)
• Docs have been reviewed and added / updated
• Lint (black rocketpy/ tests/) has passed locally
• All tests (pytest tests -m slow --runslow) have passed locally
• CHANGELOG.md has been updated (if relevant)

Current behavior

The MonteCarlo class only reads and writes .txt files (JSONL format, one JSON object per line) for simulation inputs, outputs, and errors. Users who want to analyze results in Excel or other tools must manually convert these files to CSV or JSON themselves.

New behavior

The MonteCarlo class can now directly export simulation results to CSV and JSON formats, and import previously exported CSV/JSON files back in. New methods:

• export_outputs_to_csv(filename) / export_outputs_to_json(filename)
• export_inputs_to_csv(filename, flatten=False) / export_inputs_to_json(filename)
• export_errors_to_csv(filename, flatten=False) / export_errors_to_json(filename)

The existing .txt (JSONL) format remains the default for simulation output since it supports streaming writes. CSV/JSON are post-processing export targets. The import_outputs, import_inputs, and import_errors methods also now accept .csv and .json files in addition to .txt.

Breaking change

• Yes
• No

Additional information

Related to issue #945.

[khushalkottaru]

Will update changelog.md and docs as needed soon.

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.17%. Comparing base (1e748d8) to head (0d3c9a0).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
rocketpy/simulation/monte_carlo.py	90.90%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #947      +/-   ##
==========================================
+ Coverage   81.12%   81.17%   +0.05%     
==========================================
  Files         107      107              
  Lines       13881    13967      +86     
==========================================
+ Hits        11261    11338      +77     
- Misses       2620     2629       +9     

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