PHASE3_PROGRESS_REPORT.md

# Phase 3 Progress Report

**Date:** 2026-02-06  
**Status:** Implementation In Progress

## Summary

Phase 3 (Array and Matrix Operations) implementation is proceeding with test-driven development. The build infrastructure is complete, baseline tests are verified, and implementation work is ongoing.

## Completed Work

### ✅ Build Infrastructure
- Compilation scripts created and working
- Build switch (`--enable-phase3`) configured
- Test baseline verified (test-array-base-complete.cc passes)

### ✅ Test Status
- **test-array-base-complete.cc**: ✅ PASSING
  - All array base class functionality verified
  - Constructors, indexing, memory management working
  - Copy-on-write functionality confirmed

### ⏳ Implementation Status

#### 3.1 Array Base Classes
- **Status**: ✅ Implementation exists and working
- **Files**: `Array-base.cc`, `Array-base.h`
- **Marking**: Already marked as "Proprietary implementation"
- **Tests**: ✅ All passing

#### 3.2 Matrix Operations
- **Status**: ⏳ Implementation exists, needs verification
- **Files**: `dMatrix.cc`, `CMatrix.cc`, `fMatrix.cc`, `fCMatrix.cc`
- **Issue**: Test compilation needs BLAS library linking fix
- **Action**: Update compilation script to properly link BLAS

#### 3.3 Array Specializations
- **Status**: ⏳ Implementation exists, needs verification
- **Files**: `dNDArray.cc`, `CNDArray.cc`, `fNDArray.cc`, `fCNDArray.cc`, etc.
- **Issue**: Test compilation needs include path fixes
- **Action**: Fix test file includes (already started)

## Current Issues

### Test Compilation Issues

1. **test-matrix-operations-complete.cc**
   - **Issue**: Missing `xsdot_` function (BLAS)
   - **Cause**: BLAS library not properly linked
   - **Fix**: Update compilation script to link external BLAS libraries

2. **test-array-specializations-complete.cc**
   - **Issue**: Include path errors (already fixed)
   - **Status**: Fixed includes, may have other compilation issues

3. **test-matrix-decompositions-complete.cc**
   - **Issue**: Include/API issues
   - **Status**: Needs investigation

## Next Steps

1. ⏳ Fix BLAS linking in compilation script
2. ⏳ Recompile all Phase 3 tests
3. ⏳ Verify all tests pass
4. ⏳ Document Phase 3 code with OCTAVE_USE_PHASE3 markers
5. ⏳ Ensure all implementations are properly marked as proprietary

## Build Switch

- **Flag**: `--enable-phase3`
- **Macro**: `OCTAVE_USE_PHASE3`
- **Status**: ✅ Configured and working
- **Isolation**: ✅ Phase 3 is independent of other phases

## Notes

- Phase 3 code is already largely implemented and marked as proprietary
- Tests verify the implementation is correct
- Main work remaining is fixing test compilation issues and ensuring proper Phase 3 marking
- All code is isolated with independent build switch for testing