---
title: vDSP_zmmul
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.2+]
path: kernel/1579976-vdsp_zmmul
---

# vDSP_zmmul

Multiplies two matrices of single-precision complex numbers out-of-place.

## Declaration

```occ
void vDSP_zmmul(const DSPSplitComplex *__A, vDSP_Stride __IA, const DSPSplitComplex *__B, vDSP_Stride __IB, const DSPSplitComplex *__C, vDSP_Stride __IC, vDSP_Length __M, vDSP_Length __N, vDSP_Length __P);
```

## Parameters

- `__A`: Single-precision complex M-by-P input matrix.
- `__IA`: Stride for A.
- `__B`: Single-precision complex P-by-Ninput matrix.
- `__IB`: Stride for B.
- `__C`: Single-precision complex M-by-N result matrix.
- `__IC`: Stride for C.
- `__M`: The number of rows in matrices A and C.
- `__N`: The number of columns in matrices B and C.
- `__P`: The number of columns in matrix A and the number of rows in matrix B.

## Discussion

Discussion This function performs an out-of-place complex multiplication of an M-by-P matrix A by a P-by-N matrix B and stores the results in an M-by-N matrix C. This performs the following operation: