sympy/sympy
Jan 2025 – Apr 2026
10 Months active
Languages Used
NonePythonDockerfileGitattributespythonrstRSTSVG
Technical Skills
Bug FixingConfigurationNumerical AnalysisSymbolic ComputationSymbolic MathematicsTesting
Leonardo Mangani
PROFILE
Leonardo Mangani
Over ten months, contributed to the sympy/sympy repository by engineering advanced stability analysis tools and refactoring core control-system modules. Developed and enhanced Routh-Hurwitz and Schur stability algorithms, implemented fraction-free polynomial handling, and unified domain logic for more reliable symbolic and numerical computations. Leveraged Python and SymPy to optimize algorithms, improve API consistency, and expand test coverage, while maintaining PEP 8 compliance and robust documentation using Sphinx and LaTeX. Focused on code quality through systematic cleanup, deduplication, and compatibility updates, enabling maintainable, high-accuracy control theory utilities and mathematical modeling features for both continuous and discrete-time systems.
Overall Statistics
Feature vs Bugs
89%Features
Repository Contributions
122Total
Bugs
4
Commits
122
Features
31
Lines of code
889,929
Activity Months10
Your Network
158 peopleShared Repositories
158
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026Month: 2026-04 — Key features delivered: ZZ Domain Functions Deduplication Refactor in sympy/sympy, consolidating duplicated ZZ-domain logic into a single fraction-free implementation to improve maintainability and reduce error-prone divergence. Major bugs fixed: none reported this month; focus was on refactor for quality and consistency. Overall impact: reduced code duplication, easier maintenance, and clearer domain handling, enabling faster future changes and more reliable behavior. Technologies/skills demonstrated: Python refactoring, domain logic consolidation, Git-based collaboration, code quality assurance and test readiness.
1 Commits • 1 Features
Apr 1, 2026Month: 2026-04 — Key features delivered: ZZ Domain Functions Deduplication Refactor in sympy/sympy, consolidating duplicated ZZ-domain logic into a single fraction-free implementation to improve maintainability and reduce error-prone divergence. Major bugs fixed: none reported this month; focus was on refactor for quality and consistency. Overall impact: reduced code duplication, easier maintenance, and clearer domain handling, enabling faster future changes and more reliable behavior. Technologies/skills demonstrated: Python refactoring, domain logic consolidation, Git-based collaboration, code quality assurance and test readiness.
April 2026
October 2025
12 Commits • 2 Features
Oct 1, 2025October 2025 monthly summary for sympy/sympy focusing on Schur stability analysis enhancements and documentation improvements. Key outcomes include exact-domain Schur stability checks for both continuous and discrete systems, improved handling of the root -1 case, expanded test coverage, and refined precision handling for polynomial evaluations. Additionally, documentation and code-quality improvements were made for Schur conditions and root-analysis utilities, including doctest formatting, docstring readability, removal of unused imports, and typo corrections. These changes increase reliability for stability analysis in control and discrete-time models, improve usability for end users, and strengthen maintainability for future work.
October 2025
12 Commits • 2 Features
Oct 1, 2025October 2025 monthly summary for sympy/sympy focusing on Schur stability analysis enhancements and documentation improvements. Key outcomes include exact-domain Schur stability checks for both continuous and discrete systems, improved handling of the root -1 case, expanded test coverage, and refined precision handling for polynomial evaluations. Additionally, documentation and code-quality improvements were made for Schur conditions and root-analysis utilities, including doctest formatting, docstring readability, removal of unused imports, and typo corrections. These changes increase reliability for stability analysis in control and discrete-time models, improve usability for end users, and strengthen maintainability for future work.
September 2025
4 Commits • 2 Features
Sep 1, 20252025-09 monthly summary: Implemented API and UX improvements in sympy/sympy control modules, standardizing sampling time terminology and printing, adding Schur stability analysis capabilities, and delivering broader documentation consistency. These changes improve accuracy, readability, and enable robust stability analysis for discrete-time systems.
4 Commits • 2 Features
Sep 1, 20252025-09 monthly summary: Implemented API and UX improvements in sympy/sympy control modules, standardizing sampling time terminology and printing, adding Schur stability analysis capabilities, and delivering broader documentation consistency. These changes improve accuracy, readability, and enable robust stability analysis for discrete-time systems.
September 2025
August 2025
38 Commits • 15 Features
Aug 1, 2025In August 2025, delivered substantive stability-analysis enhancements, API cleanups, and quality improvements across sympy/sympy. Implemented EXRAW integration into dup_routh_hurwitz_dom and domain exclusions for complex inputs, added a fraction-free Routh-Hurwitz method, and refined domain handling. Improved Poly algorithm performance and test organization, including merge-conflict resolution and test relocation. Standardized Hurwitz conditions naming and exposed the API at the top level. Expanded documentation and LaTeX/pretty-print improvements, plus extensive code cleanup and robustness work (infinite-loop prevention, removal of DiscreteStateSpace usage, and faster parameter additions). These changes improve accuracy, API clarity, and maintainability, enabling more reliable stability analyses and easier downstream integration.
August 2025
38 Commits • 15 Features
Aug 1, 2025In August 2025, delivered substantive stability-analysis enhancements, API cleanups, and quality improvements across sympy/sympy. Implemented EXRAW integration into dup_routh_hurwitz_dom and domain exclusions for complex inputs, added a fraction-free Routh-Hurwitz method, and refined domain handling. Improved Poly algorithm performance and test organization, including merge-conflict resolution and test relocation. Standardized Hurwitz conditions naming and exposed the API at the top level. Expanded documentation and LaTeX/pretty-print improvements, plus extensive code cleanup and robustness work (infinite-loop prevention, removal of DiscreteStateSpace usage, and faster parameter additions). These changes improve accuracy, API clarity, and maintainability, enabling more reliable stability analyses and easier downstream integration.
July 2025
7 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary: Implemented key stabilization capability and improved test robustness in the SymPy repository (sympy/sympy).
7 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary: Implemented key stabilization capability and improved test robustness in the SymPy repository (sympy/sympy).
July 2025
June 2025
19 Commits • 2 Features
Jun 1, 2025June 2025 - SymPy/Physics.Control: Major overhaul of the Routh-Hurwitz stability module, alongside observability/controllability enhancements and rigorous code quality improvements. The work emphasizes business value through stable analysis, API consistency, and maintainability, enabling faster feature delivery and reduced maintenance burden.
June 2025
19 Commits • 2 Features
Jun 1, 2025June 2025 - SymPy/Physics.Control: Major overhaul of the Routh-Hurwitz stability module, alongside observability/controllability enhancements and rigorous code quality improvements. The work emphasizes business value through stable analysis, API consistency, and maintainability, enabling faster feature delivery and reduced maintenance burden.
May 2025
5 Commits • 1 Features
May 1, 2025May 2025 monthly summary for sympy/sympy: Key feature delivery in the physics.control stability analysis with Extended Routh's Table, handling tricky cases such as zero rows and zeros in the first column, and supporting multiple, structured outputs. Work included a comprehensive refactor to consistently use Poly for polynomial handling, cleanup of dead imports, and expansion of stability condition checks. All changes were backed by new tests to validate robustness and accuracy. This release improves reliability of control-system analysis, enhances maintainability, and strengthens test coverage for future enhancements.
5 Commits • 1 Features
May 1, 2025May 2025 monthly summary for sympy/sympy: Key feature delivery in the physics.control stability analysis with Extended Routh's Table, handling tricky cases such as zero rows and zeros in the first column, and supporting multiple, structured outputs. Work included a comprehensive refactor to consistently use Poly for polynomial handling, cleanup of dead imports, and expansion of stability condition checks. All changes were backed by new tests to validate robustness and accuracy. This release improves reliability of control-system analysis, enhances maintainability, and strengthens test coverage for future enhancements.
May 2025
April 2025
16 Commits • 4 Features
Apr 1, 2025April 2025 monthly summary for sympy/sympy control module focused on delivering robust stability analysis enhancements, state-space manipulation utilities, and maintenance improvements. Key features delivered include LTI stability enhancements with a cancel_poles_zeros control, unified behavior across to_standard_form, is_stable, and get_asymptotic_stability_conditions with tests and documentation updated; addition of state-space similarity transform utilities and observable/controllable form conversions; core improvements to negative real roots stability checks; plus comprehensive maintenance/documentation updates to support CI and code quality. Business value sits in more reliable, API-consistent stability analysis, enhanced model manipulation capabilities, and improved code quality and maintainability. Technologies demonstrated include Python, SymPy, control theory concepts (state-space, stability), doctests and unit tests, PEP8, Docker/CI pipelines, and documentation practices.
April 2025
16 Commits • 4 Features
Apr 1, 2025April 2025 monthly summary for sympy/sympy control module focused on delivering robust stability analysis enhancements, state-space manipulation utilities, and maintenance improvements. Key features delivered include LTI stability enhancements with a cancel_poles_zeros control, unified behavior across to_standard_form, is_stable, and get_asymptotic_stability_conditions with tests and documentation updated; addition of state-space similarity transform utilities and observable/controllable form conversions; core improvements to negative real roots stability checks; plus comprehensive maintenance/documentation updates to support CI and code quality. Business value sits in more reliable, API-consistent stability analysis, enhanced model manipulation capabilities, and improved code quality and maintainability. Technologies demonstrated include Python, SymPy, control theory concepts (state-space, stability), doctests and unit tests, PEP8, Docker/CI pipelines, and documentation practices.
March 2025
17 Commits • 1 Features
Mar 1, 2025March 2025 performance highlights for sympy/sympy focused on stabilizing control-related analytics via the Routh-Hurwitz framework. Delivered a robust RouthHurwitz stability analysis module with table generation, asymptotic stability conditions, and standard form conversion; improved handling of zero/infinite elements; added tests and comprehensive documentation; performance refactors to routh table calculations and first-column access; updated stability logic and API reliability.
17 Commits • 1 Features
Mar 1, 2025March 2025 performance highlights for sympy/sympy focused on stabilizing control-related analytics via the Routh-Hurwitz framework. Delivered a robust RouthHurwitz stability analysis module with table generation, asymptotic stability conditions, and standard form conversion; improved handling of zero/infinite elements; added tests and comprehensive documentation; performance refactors to routh table calculations and first-column access; updated stability logic and API reliability.
March 2025
January 2025
3 Commits • 1 Features
Jan 1, 2025Monthly summary for 2025-01: Focused on stabilizing numerical functionality and improving repository maintainability in sympy/sympy. Delivered a targeted bug fix for the inverse Laplace transform, enhanced repository hygiene and test coverage, and expanded tests to guard against regressions. This work reduces runtime errors for users, strengthens contribution governance, and increases long-term maintainability and confidence in the project.
January 2025
3 Commits • 1 Features
Jan 1, 2025Monthly summary for 2025-01: Focused on stabilizing numerical functionality and improving repository maintainability in sympy/sympy. Delivered a targeted bug fix for the inverse Laplace transform, enhanced repository hygiene and test coverage, and expanded tests to guard against regressions. This work reduces runtime errors for users, strengthens contribution governance, and increases long-term maintainability and confidence in the project.
Activity
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Quality Metrics
Correctness94.0%
Maintainability92.6%
Architecture90.0%
Performance86.6%
AI Usage20.2%
Skills & Technologies
Programming Languages
DockerfileGitattributesNonePythonRSTSVGpythonreStructuredTextrst
Technical Skills
API DesignAlgorithm DevelopmentAlgorithm ImplementationAlgorithm ImprovementAlgorithm OptimizationAlgorithm RefactoringBug FixingBuild EngineeringClass Method ImplementationCode CleanupCode CompatibilityCode DocumentationCode FormattingCode OptimizationCode Quality
Repositories Contributed To
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