TD_DFFT

At its core, this function takes a logical-runtime series - time series or spatial series - as an input and transforms the series from the time or spatial domain to the temporal frequency or spatial frequency domain, respectively. The input logical-runtime series can contain elements which are either real numbers PAYLOAD(CONTENT(REAL) | CONTENT(MULTIVAR_REAL)) or complex numbers PAYLOAD(CONTENT(COMPLEX) | CONTENT(MULTIVAR_COMPLEX)). The result series is always a multivariate series containing Fourier coefficients, whose elements are either complex numbers with real and imaginary components - OUTPUT_FMT(CONTENT(COMPLEX) | CONTENT(MULTIVAR_COMPLEX)); or, alternatively, whose elements consist of amplitude and phase number pairs - OUTPUT_FMT(CONTENT(AMPL_PHASE_DEGREES) | CONTENT(AMPL_PHASE_RADIANS) | CONTENT(AMPL_PHASE) | CONTENT(MULTIVAR_AMPL_PHASE_DEGREES) | CONTENT(MULTIVAR_AMPL_PHASE_RADIANS) | CONTENT(MULTIVAR_AMPL_PHASE) ). The default index of this output series is integer-based. It starts at the negative Nyquist frequency (-N/2) and goes up to the positive Nyquist frequency (N/2). Other choices for output indexes are also available to the user.

Input ports

1. Type: DB Session
   Teradata Connection
   Connection to a Teradata Database Instance
2. Type: Table
   Input
   a logical-runtime series - time series or spatial series - as an input

Output ports

1. Type: Table
   output of TD_DFFT
   output of TD_DFFT