Function

# vDSP_convD(_:_:_:_:_:_:_:_:)

Performs either correlation or convolution on two real double-precision vectors.

## Parameters

`__A`

Real double-precision input signal vector. The length of this vector must be at least N + P - 1.

`__IA`

The stride through `A`.

`__F`

Real double-precision filter vector.

`__IF`

The stride through `F`.

`__C`

Real double-precision output signal vector.

`__IC`

The stride through `C`.

`__N`

The length of `C`.

`__P`

The length of `F`.

## Discussion

If __`IF` is positive, `vDSP_convD(_:_:_:_:_:_:_:_:)` performs correlation. If __`IF` is negative, it performs convolution and `F` must point to the last vector element. The function can run in place, but `C` cannot be in place with `F`:

### Real Vectors

`static func convolve<T, U>(T, withKernel: U) -> [Double]`

Returns the 1D convolution of a double-precision vector.

`static func convolve<T, U>(T, withKernel: U) -> [Float]`

Returns the 1D convolution of a single-precision vector.

`static func convolve<T, U, V>(T, withKernel: U, result: inout V)`

Calculates the 1D convolution of a double-precision vector.

`static func convolve<T, U, V>(T, withKernel: U, result: inout V)`

Calculates the 1D convolution of a single-precision vector.

`static func correlate<T, U>(T, withKernel: U) -> [Double]`

Returns the correlation of a double-precision signal vector and a filter vector.

`static func correlate<T, U>(T, withKernel: U) -> [Float]`

Returns the correlation of a single-precision signal vector and a filter vector.

`static func correlate<T, U, V>(T, withKernel: U, result: inout V)`

Calculates the correlation of a double-precision signal vector and a filter vector.

`static func correlate<T, U, V>(T, withKernel: U, result: inout V)`

Calculates the correlation of a single-precision signal vector and a filter vector.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.