---
title: vDSP_zvmul
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.0+]
path: kernel/1579954-vdsp_zvmul
---

# vDSP_zvmul

Multiplies two complex vectors, optionally conjugating one of them; single precision.

## Declaration

```occ
void vDSP_zvmul(const DSPSplitComplex *__A, vDSP_Stride __IA, const DSPSplitComplex *__B, vDSP_Stride __IB, const DSPSplitComplex *__C, vDSP_Stride __IC, vDSP_Length __N, int __Conjugate);
```

## Parameters

- `__A`: Single-precision complex input vector.
- `__IA`: Stride for A.
- `__B`: Single-precision complex input vector.
- `__IB`: Stride for B.
- `__C`: Single-precision complex output vector.
- `__IC`: Stride for C.
- `__N`: The number of elements to process.
- `__Conjugate`: Set this parameter to 1 for normal or -1 for conjugate multiplication, respectively. Results are undefined for other values; represented by F in the discussion

## Discussion

Discussion If Conjugate = 1, this function multiplies the first N complex elements of A by corresponding complex elements of B. If Conjugate = -1, it multiplies the complex conjugates of the first N complex elements of A by corresponding complex elements of B. In either case, the complex results are left in C:

where F stands for Conjugate.