TD_​POWERSPEC

The Power Spectrum function is another function which converts a series from the time or spatial domain over to the frequency domain in order to facilitate Frequency Domain Analysis. Once in the frequency domain, it makes it easier for the data scientist to identify periodicities that are inherent in the series, thereby enabling the data scientist to then eliminate them from the series.

Options

ALGORITHM

ALGORITHM('AUTOCOV') - Use the Fourier Cosine of the Auto covariance approach to calculate power spectrumALGORITHM('AUTOCORR') - Use the Fourier Cosine of the Auto correlation approach to calculate power spectrumALGORITHM('FOURIER') - Use the Fourier Transform approach to calculate power spectrumALGORITHM('INCRFOURIER') - Use the Incremental Fourier Transform approach to calculate power spectrum

FREQ_STYLE

FREQ_STYLE (FK) - The ROW_AXIS scale if frequency: fk = k/N = wk/2π = 1/P FREQ_STYLE (WK) - The ROW_AXIS scale if angular frequency: wk = 2πk/N = 2πfk = 2π/P FREQ_STYLE (PERIODICITY) - Periodicity = P = 1/fk = 2π/wk = N/k

HERTZ_SAMPLE_RATE

Floating point constant representing the sample rate, in hertz. A value of 10000.0 means that the sample points were obtained by sampling at a rate of 10,000 hertz.

INCRFOURIER_PARAM.INTERVAL_LENGTH

INCRFOURIER_PARAM.SPACING_INTERVAL

Output Schema

Output Schema, if Volatile is true then use user login as the schema.

Output Table

Output Table

VAL Location

VAL Location

Volatile

Specifies whether the table should be a VOLATILE table. If true, then the table is automatically deleted, otherwise it is users responsibility to remove or clean it up for space.

WINDOW.WINDOW_NAME

WINDOW('NONE') - Do not apply a smoothing window. Theoretically this translates into the application of a square wave window, which has a magnitude of '1.0' for the whole duration of the window.WINDOW_NAME('TUKEY') - Apply a Tukey smoothing window with the supplied alpha valueWINDOW_NAME ('BARTLETT') - Apply a Bartlett smoothing windowWINDOW_NAME ('PARZEN') - Apply a Parzen smoothing windowWINDOW_NAME ('WELCH') - Apply a Welch smoothing window

WINDOW.WINDOW_PARAM

Optional Parameter. Only valid with a FREQ_STYLE(K_HERTZ). A Floating point constant representing the sample rate, in hertz. A value of 10000.0 means that the sample points were obtained by sampling at a rate of 10,000 hertz.

ZERO_PADDING_OK

Determines whether it is OK to add zeros to the end of a given Series to achieve a more efficient computation of the FFT coefficients. A value of '1' means true; a value of '0' means false. Default is true.

Nodes

• String Configuration7 ×
• Single Selection Configuration3 ×
• Python Script2 ×
• Boolean Configuration1 ×
• Component Input1 ×
• Show all 13 nodes

Extensions

• FeatureKNIME Base nodes
• FeatureKNIME Database
• FeatureKNIME Quick Forms

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