fft class

Namespace: Ans.DataProcessing.operators.mapping

Summary

Computes the Fast Fourier Transform on each component of input Field or each field of input Fields Container (you can use transpose_fields_container to have relevant scoping). Fields are assumed with the same scoping, number of components and representing equally spaced data, ideally resampled to have a 2^n points (prepare_sampling_fft with time_freq_interpolation can help creating these fields). If Complex label is present, Complex to Complex FFT performed otherwise Real to Complex is performed (only half of the coefficient will be returned).

available inputs: field (Field, FieldsContainer), scale_forward_transform (double) (optional), inplace (bool) (optional), force_fft_points (Int32) (optional), cutoff_frequency (double) (optional), scale_right_amplitude (bool) (optional)

available outputs: fields_container (FieldsContainer)

Example

op = fft()

op = fft(field=my_field,scale_forward_transform=my_scale_forward_transform,inplace=my_inplace,force_fft_points=my_force_fft_points,cutoff_frequency=my_cutoff_frequency,scale_right_amplitude=my_scale_right_amplitude)

Class Information

Property	Value
Namespace	Ans.DataProcessing.operators.mapping
Assembly	Ans_Dpf_Math_dll_cs
Base Class	Ans.DataProcessing.internal_objects.BaseOperator

Inputs

field

Field or Fields Container.

Type: LinkableInput

scale_forward_transform

Scale for Forward Transform, default is 2/field_num_elementary_data.

Type: LinkableInput

inplace

True if inplace, default is false.

Type: LinkableInput

force_fft_points

Explicitely define number of fft points to either rescope or perform zero padding.

Type: LinkableInput

cutoff_frequency

Restrict output frequency up to this cutoff frequency

Type: LinkableInput

scale_right_amplitude

If set to true (default is false), 2/field_num_entities scaling will be applied, to have right amplitude values.

Type: LinkableInput

Outputs

fields_container

Output Complex Fields Container with labels matching input Fields Container. No supports binded, but prepare_sampling_fft provides it.

Type: LinkableOutput

Constructors

Constructor

fft()

Constructor

fft(field, scale_forward_transform, inplace, force_fft_points, cutoff_frequency, scale_right_amplitude, config)

Parameters:

• field (object)
• scale_forward_transform (object)
• inplace (object)
• force_fft_points (object)
• cutoff_frequency (object)
• scale_right_amplitude (object)
• config (OperatorConfig)

Constructor

fft(config)

Parameters:

• config (OperatorConfig)

Methods

Properties

inputs

Type: InputSpec

# Get or set the property
value = obj.inputs
obj.inputs = new_value

outputs

Type: OutputSpec

# Get or set the property
value = obj.outputs
obj.outputs = new_value

defaultConfig

Type: Config

# Get the property (read-only)
value = obj.defaultConfig