Fft &lt; T &gt; . Backward Transform Method

input is null.

-or-

output is null.

The length of input does not equal the length of output.

BackwardTransform(ArraySlice<Complex<T>>, ArraySlice<Complex<T>>)

Computes the discrete Fourier transform of a complex signal.

public void BackwardTransform(
	ArraySlice<Complex<T>> input,
	ArraySlice<Complex<T>> output
)

Visual Basic

Public Sub BackwardTransform ( 
	input As ArraySlice(Of Complex(Of T)),
	output As ArraySlice(Of Complex(Of T))
)

C++/CLI

public:
void BackwardTransform(
	ArraySlice<Complex<T>> input, 
	ArraySlice<Complex<T>> output
)

member BackwardTransform : 
        input : ArraySlice<Complex<'T>> * 
        output : ArraySlice<Complex<'T>> -> unit

Parameters

input ArraySlice<Complex<T>>: A complex array slice containing the input signal.
output ArraySlice<Complex<T>>: A complex array slice to hold the transformed signal.

Exceptions

The Fourier transform implementation is not configured to accept real input.

input is null.

-or-

output is null.

The length of input does not equal the length of output.

BackwardTransform(ComplexConjugateSignalVector<T>, DenseVector<T>)

Computes the discrete Fourier transform of a real signal.

public void BackwardTransform(
	ComplexConjugateSignalVector<T> input,
	DenseVector<T> output
)

Visual Basic

Public Sub BackwardTransform ( 
	input As ComplexConjugateSignalVector(Of T),
	output As DenseVector(Of T)
)

C++/CLI

public:
void BackwardTransform(
	ComplexConjugateSignalVector<T>^ input, 
	DenseVector<T>^ output
)

member BackwardTransform : 
        input : ComplexConjugateSignalVector<'T> * 
        output : DenseVector<'T> -> unit

Parameters

input ComplexConjugateSignalVector<T>: A dense complex vector to hold the transformed signal.
output DenseVector<T>: A Double vector containing the input signal.

Exceptions

input is null.

-or-

output is null.

The length of input does not equal the length of output.

BackwardTransform(DenseVector<Complex<T>>, DenseVector<Complex<T>>)

Computes the discrete Fourier transform of a complex signal.

public void BackwardTransform(
	DenseVector<Complex<T>> input,
	DenseVector<Complex<T>> output
)

Visual Basic

Public Sub BackwardTransform ( 
	input As DenseVector(Of Complex(Of T)),
	output As DenseVector(Of Complex(Of T))
)

C++/CLI

public:
void BackwardTransform(
	DenseVector<Complex<T>>^ input, 
	DenseVector<Complex<T>>^ output
)

member BackwardTransform : 
        input : DenseVector<Complex<'T>> * 
        output : DenseVector<Complex<'T>> -> unit

Parameters

input DenseVector<Complex<T>>: A dense complex vector containing the input signal.
output DenseVector<Complex<T>>: A dense complex vector to hold the transformed signal.

Exceptions

The Fourier transform implementation is not configured to accept real input.

input is null.

-or-

output is null.

The length of input does not equal the length of output.

BackwardTransform(Vector<Complex<T>>, Vector<T>)

Computes the discrete Fourier transform of a real signal.

public void BackwardTransform(
	Vector<Complex<T>> input,
	Vector<T> output
)

Visual Basic

Public Sub BackwardTransform ( 
	input As Vector(Of Complex(Of T)),
	output As Vector(Of T)
)

C++/CLI

public:
void BackwardTransform(
	Vector<Complex<T>>^ input, 
	Vector<T>^ output
)

member BackwardTransform : 
        input : Vector<Complex<'T>> * 
        output : Vector<'T> -> unit

Parameters

input Vector<Complex<T>>: A complex vector to hold the transformed signal.
output Vector<T>: A Double vector containing the input signal.

Remarks

This method transforms a complex signal to a real signal. Only the values in the first half of input are used. The second half of the input vector is assumed to be the complex conjugate of the first half.

Exceptions

The Fourier transform implementation is not configured to accept real input.

input is null.

-or-

output is null.

BackwardTransform(Vector<Complex<T>>, Vector<Complex<T>>)

Computes the discrete Fourier transform of a complex signal.

public void BackwardTransform(
	Vector<Complex<T>> input,
	Vector<Complex<T>> output
)

Visual Basic

Public Sub BackwardTransform ( 
	input As Vector(Of Complex(Of T)),
	output As Vector(Of Complex(Of T))
)

C++/CLI

public:
void BackwardTransform(
	Vector<Complex<T>>^ input, 
	Vector<Complex<T>>^ output
)

member BackwardTransform : 
        input : Vector<Complex<'T>> * 
        output : Vector<Complex<'T>> -> unit

Parameters

input Vector<Complex<T>>: A complex vector containing the input signal.
output Vector<Complex<T>>: A complex vector to hold the transformed signal.

BackwardTransform(Vector<Complex<T>>, Vector<T>, RealFftFormat)

Computes the inverse discrete Fourier transform of a real signal.

public void BackwardTransform(
	Vector<Complex<T>> input,
	Vector<T> output,
	RealFftFormat outputFormat
)

Visual Basic

Public Sub BackwardTransform ( 
	input As Vector(Of Complex(Of T)),
	output As Vector(Of T),
	outputFormat As RealFftFormat
)

C++/CLI

public:
void BackwardTransform(
	Vector<Complex<T>>^ input, 
	Vector<T>^ output, 
	RealFftFormat outputFormat
)

member BackwardTransform : 
        input : Vector<Complex<'T>> * 
        output : Vector<'T> * 
        outputFormat : RealFftFormat -> unit

Parameters

input Vector<Complex<T>>: A complex vector containing the transformed signal.
output Vector<T>: A Double vector to hold the restored real signal.
outputFormat RealFftFormat: A RealFftFormat value that specifies whether to return a one-sided or a two-sided transform.

Remarks

Use this method to compute the inverse Fourier transform of a real signal. The outputFormat specifies whether the input contains the full complex transform (TwoSided), or only the first n/2+1 terms of the transformed signal (OneSided), where n is the length of the transform.

Exceptions

InvalidOperationException	The Fourier transform implementation is not configured to accept real input.
ArgumentNullException	input is null. -or- output is null.
ArgumentOutOfRangeException	outputFormat is not a valid RealFftFormat value.
DimensionMismatchException	outputFormat equals OneSided and the length of input does not equal half the length of output plus one. -or- outputFormat equals TwoSided and the length of input does not equal the length of output.

BackwardTransform(ReadOnlySpan<Complex<T>>, Int32, Span<T>, Int32)

Computes the discrete Fourier transform of a real signal.

public abstract void BackwardTransform(
	ReadOnlySpan<Complex<T>> input,
	int inputStride,
	Span<T> output,
	int outputStride
)

Visual Basic

Public MustOverride Sub BackwardTransform ( 
	input As ReadOnlySpan(Of Complex(Of T)),
	inputStride As Integer,
	output As Span(Of T),
	outputStride As Integer
)

C++/CLI

public:
virtual void BackwardTransform(
	ReadOnlySpan<Complex<T>> input, 
	int inputStride, 
	Span<T> output, 
	int outputStride
) abstract

abstract BackwardTransform : 
        input : ReadOnlySpan<Complex<'T>> * 
        inputStride : int * 
        output : Span<'T> * 
        outputStride : int -> unit

Parameters

input ReadOnlySpan<Complex<T>>: A complex span that contains the transformed signal.
inputStride Int32: The distance between successive elements in input.
output Span<T>: A real span to contain the original signal.
outputStride Int32: The distance between successive elements in output.

Exceptions

input is null.

-or-

output is null.

The length of input does not equal the length of output.

BackwardTransform(ReadOnlySpan<Complex<T>>, Int32, Span<Complex<T>>, Int32)

Computes the discrete Fourier transform of a complex signal.

public abstract void BackwardTransform(
	ReadOnlySpan<Complex<T>> input,
	int inputStride,
	Span<Complex<T>> output,
	int outputStride
)

Visual Basic

Public MustOverride Sub BackwardTransform ( 
	input As ReadOnlySpan(Of Complex(Of T)),
	inputStride As Integer,
	output As Span(Of Complex(Of T)),
	outputStride As Integer
)

C++/CLI

public:
virtual void BackwardTransform(
	ReadOnlySpan<Complex<T>> input, 
	int inputStride, 
	Span<Complex<T>> output, 
	int outputStride
) abstract

abstract BackwardTransform : 
        input : ReadOnlySpan<Complex<'T>> * 
        inputStride : int * 
        output : Span<Complex<'T>> * 
        outputStride : int -> unit

Parameters

input ReadOnlySpan<Complex<T>>: A complex span containing the input signal.
inputStride Int32: The distance between successive elements in input.
output Span<Complex<T>>: A complex span to hold the transformed signal.
outputStride Int32: The distance between successive elements in output.

Exceptions

The Fourier transform implementation is not configured to accept real input.

input is null.

-or-

output is null.