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# SparsePreconditioner_t

Constants that define the preconditioner type.

```
struct SparsePreconditioner_t
```

## Topics

### Constants

[`SparsePreconditionerDiagScaling`](/documentation/Accelerate/SparsePreconditionerDiagScaling)

A diagonal scaling preconditioner.

[`SparsePreconditionerDiagonal`](/documentation/Accelerate/SparsePreconditionerDiagonal)

A Jacobi preconditioner.

[`SparsePreconditionerNone`](/documentation/Accelerate/SparsePreconditionerNone)

No preconditioner.

[`SparsePreconditionerUser`](/documentation/Accelerate/SparsePreconditionerUser)

A user-provided preconditioner.

### Raw Values

[`init(_:)`](/documentation/Accelerate/SparsePreconditioner_t/init(_:))

[`init(rawValue:)`](/documentation/Accelerate/SparsePreconditioner_t/init(rawValue:))

[`rawValue`](/documentation/Accelerate/SparsePreconditioner_t/rawValue)

## Relationships

### Conforms To

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`BitwiseCopyable`](/documentation/Swift/BitwiseCopyable)

[`Sendable`](/documentation/Swift/Sendable)

---

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