---
title: vDSP_biquadm_SetCoefficientsSingle
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.11+]
path: kernel/1579969-vdsp_biquadm_setcoefficientssing
---

# vDSP_biquadm_SetCoefficientsSingle

Updates single-precision coefficients within a valid single-precision multichannel biquad IIR filter object.

## Declaration

```occ
void vDSP_biquadm_SetCoefficientsSingle(vDSP_biquadm_Setup __setup, const float *__coeffs, vDSP_Length __start_sec, vDSP_Length __start_chn, vDSP_Length __nsec, vDSP_Length __nchn);
```

## Parameters

- `__setup`: The filter state object whose coefficients you wish to update.
- `__coeffs`: An input array of single-precision coefficients.
- `__start_sec`: First section to update in each channel.
- `__start_chn`: First channel to update.
- `__nsec`: Number of sections to update in each channel.
- `__nchn`: Number of channels to update.

## Discussion

Discussion Use this function to update sections of coefficient values of a biquad setup structure. This function doesn’t allocate new memory. The range specified by __start_sec and __nsec must be within the number of sections defined by the create setup function.