FFT Arguments - Aster Analytics

Teradata Aster® Analytics Foundation User GuideUpdate 2

Product
Aster Analytics
Release Number
7.00.02
Published
September 2017
Language
English (United States)
Last Update
2018-04-17
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B700-1022
lifecycle
previous
Product Category
Software
ValueColumns
Specifies the names of one to 16 inputtable columns that contain the signal values on which to perform FFT.
NumDimensions
[Optional] Specifies the number of dimensions in the signal. The parameter dimensions must be the INTEGER value 1, 2, or 3. (A time series has one dimension; an image has two or three.) Default: 1.
FFTLength
[Optional] Specifies the maximum signal length. The parameter FFT_length must be an INTEGER. Default: 224. If the signal length exceeds FFT_length, the function truncates it to FFT_length.
In a signal with more than one dimension, each dimension must have the same length.
OutputPolarCoordinates
[Optional] Specifies whether to output polar coordinates—(magnitude, phase). Default: 'false'.
InputPolarCoordinates
[Optional] Relevant only if IsSignalRealValued is 'true'. Specifies whether to read complex numbers as polar coordinates—(magnitude, phase). Default: 'false'.
PadNonPowerOfTwoLengths
[Optional] Specifies whether to pad the input signal with zeros to round up to the closest power of two. Default: 'true'. If you specify 'false', the function truncates the input signal and rounds down to the closest power of 2 dimensions that is less than the input signal.
IsSignalRealValued
[Optional] Specifies whether the value columns contain REAL (DOUBLE PRECISION) values. Default: 'true'. If you specify 'false', the function interprets the values as complex numbers; therefore, they must be multiples of two.