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# SparseMultiply(_:_:_:)

Perform the multiply operation `y = Subfactor * x` in place for complex double values.

```
func SparseMultiply(_ Subfactor: SparseOpaqueSubfactor_Complex_Double, _ XY: DenseVector_Complex_Double, _ workspace: UnsafeMutableRawPointer)
```

## Parameters

`Subfactor`

(input) The subfactor to multiply by, as returned by
`SparseCreateSubfactor()`.

`workspace`

(scratch) A workspace of size
`Subfactor.workspaceRequiredStatic + 1*Subfactor.workspaceRequiredPerRHS * 2`.
This memory must be 16-byte aligned (any allocation returned
by `malloc()` has this property).

---

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