> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# vmulComplex

> vmulComplex

# vmulComplex

Don't use; internal use only.

## Syntax

```cpp theme={null}
void vmulComplex(  
         XMVECTOR& r1,  
         XMVECTOR& i1,  
         FXMVECTOR r2,  
         FXMVECTOR i2  
)  
```

### Parameters

*r1*   \_Inout\_\
Type: XMVECTOR&

Don't use; internal use only.

*i1*   \_Inout\_\
Type: XMVECTOR&

Don't use; internal use only.

*r2*   \_In\_\
Type: FXMVECTOR

Don't use; internal use only.

*i2*   \_In\_\
Type: FXMVECTOR

Don't use; internal use only.

### Return value

Type: void

Don't use; internal use only.

## Remarks

Don't use; internal use only.

**vmulComplex** is a helper function that is used by the XDSP Fast Fourier Transform (FFT) functions. It is not intended to be used directly by a title.

## Requirements

**Header:** xdsp.h

**Supported platforms:** XBOX One family consoles and XBOX Series consoles

## See also

[xdsp](/reference/audio/xdsp/xdsp_members)

[FFT](/reference/audio/xdsp/functions/fft)

[Game for Windows and the DirectX SDK blog](https://walbourn.github.io/xdsp-h-digital-signal-processing-helper-functions/)


## Related topics

- [vmulComplex function](/reference/audio/xdsp/functions/vmulcomplex.md)
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