1.1 - 8.10 - FFT Example: 3D Signal - Teradata Vantage

Teradata Vantage™ - Machine Learning Engine Analytic Function Reference

Product
Teradata Vantage
Release Number
1.1
8.10
Release Date
October 2019
Content Type
Programming Reference
Publication ID
B700-4003-079K
Language
English (United States)

In this example, the signal is three-dimensional (3D).

Input

The InputTable has one time sequence of 3D signals of length 8, represented by this 2x2x2 matrix in the value1 column: ( ( (1, 2) (3, 4) ) ( (5, 6) (7, 8) ) )

InputTable: fft_input3
id1 timestep value1
1 1 1
1 2 2
1 3 3
1 4 4
1 5 5
1 6 6
1 7 7
1 8 8

SQL Call

CREATE MULTISET TABLE fft_output_3 AS (
  SELECT * FROM FFT (
    ON fft_input3 AS InputTable PARTITION BY id1 ORDER BY timestep
    USING
    TargetColumns ('value1')
    Dimensions (3)
  ) AS dt
) WITH DATA;

Output

SELECT * FROM fft_output_3;
 id_0 timestep real_value1 imag_value1 
 ---- -------- ----------- ----------- 
    1        3        -8.0         0.0
    1        5       -16.0         0.0
    1        6         0.0         0.0
    1        7         0.0         0.0
    1        8         0.0         0.0
    1        4         0.0         0.0
    1        2        -4.0         0.0
    1        1        36.0         0.0

Download a zip file of all examples and a SQL script file that creates their input tables from the attachment in the left sidebar.