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Add Python bindings for derived field computation and statistics: - calculate_field_stats(data): Compute min, max, avg, sum for any field - compute_velocity_magnitude(u, v, nx, ny): Compute sqrt(u^2 + v^2) - compute_flow_statistics(u, v, p, nx, ny): Comprehensive stats for all flow field components including velocity magnitude All functions include proper error handling for empty lists, wrong types, and size mismatches. Comprehensive tests added in test_derived_fields.py.
Resolved merge conflicts to include both: - Phase 3: Derived Fields & Statistics API - Phase 5: Backend Availability API (v0.1.6)
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Pull request overview
This PR implements Phase 3 of the migration plan by adding a derived fields and statistics API to cfd_python. The new API provides three functions for computing field statistics and derived quantities from CFD simulation data.
- Adds
calculate_field_stats()for computing min/max/avg/sum statistics on arbitrary field data - Adds
compute_velocity_magnitude()for calculating velocity magnitude from u/v components - Adds
compute_flow_statistics()for comprehensive statistics on all flow field components
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 9 comments.
Show a summary per file
| File | Description |
|---|---|
tests/test_derived_fields.py |
Comprehensive test suite for all three new functions with edge cases and error handling |
src/cfd_python.c |
C implementation of Python bindings for the three derived fields functions |
cfd_python/_loader.py |
Exports the new functions from the C extension module |
cfd_python/__init__.py |
Updates module docstring and all to include new functions |
MIGRATION_PLAN.md |
Marks Phase 3 as completed with actual effort tracking |
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PyDict_SetItemString increments the reference count of the value, so PyFloat_FromDouble results must be DECREFed after insertion. The ADD_STATS macro now stores each PyFloat in a temp variable and properly calls Py_DECREF after PyDict_SetItemString, following the established pattern from ADD_TO_STATS at line 519-524.
Consistent with the import style used in test_boundary_conditions.py and other test files in the codebase.
PyDict_SetItemString returns -1 on failure. Both calculate_field_stats_py and the ADD_STATS macro now check these return values and properly clean up resources before returning NULL on error.
Ruff's isort enforces alphabetical ordering, which made the section comments inaccurate (e.g., clear_error was listed under "Derived fields" instead of "Error handling"). Removed all section comments from the import block since they don't provide value when imports are auto-sorted.
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Pull request overview
Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.
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| | Phase 5: Backend Availability (v0.1.6) | ✅ 0.5 days | 4 days | | ||
| | Phase 6: CPU Features | 1 day | 5 days | | ||
| | Phase 7: Docs & Tests | 2 days | 7 days | | ||
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The cumulative timeline is confusing because phases were completed out of order (Phase 5 before Phase 3 and 4). Consider either: (1) reordering the table to show completion order with actual cumulative times, or (2) adding a note that explains the cumulative column shows estimated sequential totals, not actual completion timeline. The "4 days" for Phase 5 cumulative appears to represent total completed work rather than sequential cumulative, which is inconsistent with other rows.
| | Phase 5: Backend Availability (v0.1.6) | ✅ 0.5 days | 4 days | | |
| | Phase 6: CPU Features | 1 day | 5 days | | |
| | Phase 7: Docs & Tests | 2 days | 7 days | | |
| | Phase 5: Backend Availability (v0.1.6) | ✅ 0.5 days | 4 days (completed work to date) | | |
| | Phase 6: CPU Features | 1 day | 5 days | | |
| | Phase 7: Docs & Tests | 2 days | 7 days | | |
| _Note: The **Cumulative** column shows a sequential estimate assuming phases are done in numeric order. Phase 5 was completed earlier than Phases 3 and 4, so its "4 days (completed work to date)" value reflects total work finished so far rather than an additional sequential day._ |
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