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# vDSP_biquad_SetCoefficientsDouble

Sets double-precision coefficients of the specified single-channel biquadratic filter setup object.

```
extern void vDSP_biquad_SetCoefficientsDouble(vDSP_biquad_Setup __setup, const double *__coeffs, vDSP_Length __start_sec, vDSP_Length __nsec);
```

## Parameters

`__setup`

The biquadratic filter setup object that the function updates.

`__coeffs`

A pointer to the new coefficients.

`__start_sec`

The first section that the function updates.

`__nsec`

The number of sections that the function updates.

## Discussion

Use this function to update sections of coefficient values of a biquad setup structure. This function doesn’t allocate new memory. The range that you specify using `__start_sec` and `__nsec` must be within the number of sections that you define in the create setup function.

---

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