matsim-org/matsim-libs
Nov 2024 – Jan 2026
6 Months active
Languages Used
JavaLaTeX
Technical Skills
Graph TraversalRouting AlgorithmsSoftware DevelopmentCode CleanupCode RefactoringDependency Management
Marcel
PROFILE
Marcel
Over six months, contributed to matsim-org/matsim-libs by building and refining core routing and analysis features for large-scale transport simulations. Focused on Java-based backend development, the work included implementing configurable analysis intervals, optimizing routing algorithms for turn restrictions, and enhancing occupancy tracking for transit models. Addressed edge cases in routing and departure logic, improved code maintainability through targeted refactoring, and standardized naming conventions to streamline onboarding. Applied skills in algorithm design, code cleanup, and unit testing to ensure robust, reliable simulation outputs. The technical approach emphasized modular changes, backward compatibility, and improved performance for complex, real-world transportation networks.
Overall Statistics
Feature vs Bugs
57%Features
Repository Contributions
11Total
Bugs
3
Commits
11
Features
4
Lines of code
22,666
Activity Months6
Your Network
31 peopleShared Repositories
31
aleksMember
anaueMember
Ricardo EwertMember
Friedrich VölkersMember
Gerry CaseyMember
paulhMember
u234825Member
Jakob RehmannMember
janekderersteMember
Work History
January 2026
1 Commits • 1 Features
Jan 1, 2026Month 2026-01: Delivered Turn-Restriction Routing Robustness and Optimization in matsim-libs, addressing edge-case handling, preserving node attributes, and optimizing route selection. The changes fix potential non-optimal solutions and guard data integrity in TurnRestrictions and TurnRestrictionsNetworkCleaner, resulting in more accurate and reliable routing for planners and travelers, especially in complex intersections. Commit 007e788cc902f559ee3885594ab5f6f5f63c4ce0 encapsulates these changes. Demonstrated Java-based routing algorithm improvements, targeted bug fixes, and disciplined Git traceability.
1 Commits • 1 Features
Jan 1, 2026Month 2026-01: Delivered Turn-Restriction Routing Robustness and Optimization in matsim-libs, addressing edge-case handling, preserving node attributes, and optimizing route selection. The changes fix potential non-optimal solutions and guard data integrity in TurnRestrictions and TurnRestrictionsNetworkCleaner, resulting in more accurate and reliable routing for planners and travelers, especially in complex intersections. Commit 007e788cc902f559ee3885594ab5f6f5f63c4ce0 encapsulates these changes. Demonstrated Java-based routing algorithm improvements, targeted bug fixes, and disciplined Git traceability.
January 2026
July 2025
3 Commits • 1 Features
Jul 1, 2025July 2025 performance summary for matsim-libs focusing on routing robustness and codebase consistency. Delivered a critical fix to chained departures routing in SwissRailRaptorCore, improving route calculation accuracy in complex networks, plus enhanced debug visibility. Completed a refactor to standardize naming across the core by renaming ControlerListener to ControllerListener, maintaining backward compatibility. These changes reduce error-prone behavior, improve maintainability, and accelerate future development and onboarding.
July 2025
3 Commits • 1 Features
Jul 1, 2025July 2025 performance summary for matsim-libs focusing on routing robustness and codebase consistency. Delivered a critical fix to chained departures routing in SwissRailRaptorCore, improving route calculation accuracy in complex networks, plus enhanced debug visibility. Completed a refactor to standardize naming across the core by renaming ControlerListener to ControllerListener, maintaining backward compatibility. These changes reduce error-prone behavior, improve maintainability, and accelerate future development and onboarding.
June 2025
1 Commits
Jun 1, 2025June 2025 performance summary focusing on feature reliability and accuracy improvements in Matsim libraries, with emphasis on occupancy tracking and departure retrieval for transit simulations.
1 Commits
Jun 1, 2025June 2025 performance summary focusing on feature reliability and accuracy improvements in Matsim libraries, with emphasis on occupancy tracking and departure retrieval for transit simulations.
June 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 highlights for matsim-org/matsim-libs: Implemented configurable analysis intervals for LegHistogram and LegStats to optimize analysis output frequency and performance. This involved refactoring configuration to use ControllerConfigGroup, enabling explicit enablement and centralized control. The change reduces unnecessary computation and I/O, improving throughput for large-scale simulations and analytic runs. This work lays groundwork for more flexible, enterprise-grade analysis pipelines and easier future enhancements.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 highlights for matsim-org/matsim-libs: Implemented configurable analysis intervals for LegHistogram and LegStats to optimize analysis output frequency and performance. This involved refactoring configuration to use ControllerConfigGroup, enabling explicit enablement and centralized control. The change reduces unnecessary computation and I/O, improving throughput for large-scale simulations and analytic runs. This work lays groundwork for more flexible, enterprise-grade analysis pipelines and easier future enhancements.
March 2025
4 Commits • 1 Features
Mar 1, 2025March 2025: Delivered a focused codebase cleanup in matsim-libs removing obsolete mobsim components and deprecated code to reduce maintenance burden and streamline MATSim. Key removals include JDEQSim, external mobsim and replanning modules, outdated user guide, and a broad sweep of deprecated code, implemented via four commits. This work improves build stability, simplifies onboarding for new contributors, and sets the stage for faster future iterations.
4 Commits • 1 Features
Mar 1, 2025March 2025: Delivered a focused codebase cleanup in matsim-libs removing obsolete mobsim components and deprecated code to reduce maintenance burden and streamline MATSim. Key removals include JDEQSim, external mobsim and replanning modules, outdated user guide, and a broad sweep of deprecated code, implemented via four commits. This work improves build stability, simplifies onboarding for new contributors, and sets the stage for faster future iterations.
March 2025
November 2024
1 Commits
Nov 1, 2024November 2024 focused on stabilizing routing in matsim-libs by addressing edge-case handling of colored nodes with turn restrictions. Implemented a fix ensuring destinations are correctly identified when restrictions are active by validating against the original node index, preventing routing failures in complex networks. This work enhances simulation fidelity and reliability for networks with turn restrictions, reducing downstream misrouting and analysis errors.
November 2024
1 Commits
Nov 1, 2024November 2024 focused on stabilizing routing in matsim-libs by addressing edge-case handling of colored nodes with turn restrictions. Implemented a fix ensuring destinations are correctly identified when restrictions are active by validating against the original node index, preventing routing failures in complex networks. This work enhances simulation fidelity and reliability for networks with turn restrictions, reducing downstream misrouting and analysis errors.
Activity
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Quality Metrics
Correctness89.0%
Maintainability89.0%
Architecture87.2%
Performance81.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
JavaLaTeX
Technical Skills
API DesignAlgorithm DesignAlgorithm DevelopmentBackend DevelopmentBug FixingCode CleanupCode RefactoringCode StandardizationConfiguration ManagementCore JavaDebuggingDependency ManagementDeprecation ManagementDocumentation ManagementEdge Case Handling
Repositories Contributed To
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