TD_​DFFT2

TD_DFFT2 takes a matrix (two-dimensional array) as an input, and returns a result matrix whose elements are the compute two-dimension Fourier Coefficients for the input matrix. The coefficients can be output as complex numbers in either rectangular (real, imaginary) or polar (amplitude, phase) form.

Options

ALGORITHM

Optional Parameter. Bypasses the internal DFFT Planner and influences the core DFFT algorithm associated with the primary DFFT calculation. Choices are: 'COOLEY_TUKEY', or 'SINGLETON'. When this parameter is NOT PRESENT. The internal DFFT 'Planner' will select the most efficient algorithm for the operation.

FREQ_STYLE

Optional Parameter. Determines format/values associated with the x-axis (ROW_I index) and y-axis (COLUMN_I index) of the output. Choices are: 'K_INTEGRAL', an integer representation.; 'K_SAMPLE_RATE': normalized to 'Number Entries', ranges from -0.5 to +0.5; 'K_RADIANS', ranges from -PI to +PI; and, 'K_HERTZ', must be used in conjunction with the 'HERTZ_SAMPLE_RATE', this represents the frequency in hertz. The Default is 'K_INTEGRAL'.

HERTZ_SAMPLE_RATE

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. This hertz interpretation will be applied to both the ROW_I and COLUMN_I indexes.

HUMAN_READABLE

Optional Parameter. Determines whether the produced output rows comprising the matrix are in a human-readable / plottable form; or if they are output in the raw-form, which is equivalent to how the 'R' and 'PYTHON' programs would output the results. A value of '1' means true, output in human readable form; a value of '0' means false, output in raw form. Default is true – output in Human Readable format.

OutputFormat

The OUTPUT_FMT (CONTENT()) construct can be used by the data scientist to choose how they would like their Fourier coefficients to be output. The can use CONTENT(COMPLEX) or CONTENT(MULTIVAR_COMPLEX) to request the Fourier coefficients in rectangular form. Alternatively, they can use CONTENT(AMPL_PHASE_RADIANS), CONTENT(AMPL_PHASE_DEGREES), CONTENT(AMPL_PHASE), CONTENT(MULTIVAR_AMPL_PHASE_RADIANS), CONTENT(MULTIVAR_AMPL_PHASE), or CONTENT(MULTIVAR_AMPL_PHASE_DEGREES) to request that the Fourier coefficients be output in the polar form; and to further request the phase to be output in radians or degrees. AMPL_PHASE is one of the permitted values, it is synonymous with AMPL_PHASE_RADIANS. Similarly MULTIVAR_AMPL_PHASE is equivalent to MULTIVAR_AMPL_PHASE_RADIANS.The default value is dependent on the datatype of the input series; a single var input will generate COMPLEX output CONTENT by default; a multi var input will generate MULTIVAR_COMPLEX output CONTENT by default.

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.

ZERO_PADDING_OK

Optional Parameter. Determines whether it is OK to add zeros to both the 'row-series' and 'column-series' comprising the matrix. Zeros are added to the end of these 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.

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