---
title: SparseFactorizationCholeskyAtA
framework: accelerate
role: symbol
role_heading: Global Variable
path: accelerate/sparsefactorizationcholeskyata
---

# SparseFactorizationCholeskyAtA

A constant that represents QR factorization without storing Q.

## Declaration

```swift
var SparseFactorizationCholeskyAtA: SparseFactorization_t { get }
```

## Discussion

Discussion SparseFactorizationCholeskyAtA provides an equivalent to AᵀA = RᵀR.

## See Also

### Factorization types for overdetermined and underdetermined systems

- [SparseFactorizationQR](accelerate/sparsefactorizationqr.md)