TD_​IDFFT2

This function simply reverses the 2D Fourier Transform. It takes as its input either a logical matrix containing Fourier coefficients in the form of complex number elements, or, alternatively, in the form of amplitude-phase pair (polar form) elements. The function then runs them through a reverse-transform summation formula, and output the original logical matrix (original 2D array) that was input into the TD_DFFT2 to generate the Fourier coefficients.

Options

HUMAN_READABLE

Required Parameter when input rows are in raw format. Informs the TD_IDDFT as to whether the incoming DFFT coefficient rows 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 produce DFFT 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.

Nodes

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