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# SparseMultiply(_:_:_:_:)

Performs the multiply operation *Y* *= Subfactor * X* on a dense matrix of double-precision values and without any internal memory allocations.

```
func SparseMultiply(_ Subfactor: SparseOpaqueSubfactor_Double, _ X: DenseMatrix_Double, _ Y: DenseMatrix_Double, _ workspace: UnsafeMutableRawPointer)
```

## Parameters

`Subfactor`

The subfactor to multiply by, which [`SparseCreateSubfactor(_:_:)`](/documentation/Accelerate/SparseCreateSubfactor(_:_:)-49d8w) returns.

`X`

The matrix *X*.

`Y`

The matrix *Y*.

`workspace`

A workspace of size `workspaceRequiredStatic` `+ nrhs *` `workspaceRequiredPerRHS` where `nrhs` is the number of right-hand-side vectors.

---

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