---
title: SparsePreconditionerDiagonal
framework: accelerate
role: symbol
role_heading: Global Variable
path: accelerate/sparsepreconditionerdiagonal
---

# SparsePreconditionerDiagonal

A Jacobi preconditioner.

## Declaration

```swift
var SparsePreconditionerDiagonal: SparsePreconditioner_t { get }
```

## Discussion

Discussion SparsePreconditionerDiagonal provides a simple preconditioner for conjugate gradient (CG) and generalized minimal residual (GMRES) methods.

## See Also

### Constants

- [SparsePreconditionerDiagScaling](accelerate/sparsepreconditionerdiagscaling.md)
- [SparsePreconditionerNone](accelerate/sparsepreconditionernone.md)
- [SparsePreconditionerUser](accelerate/sparsepreconditioneruser.md)