FFT Functions

The fast Fourier transform function library of Intel MKL provides one-dimensional, two-dimensional, and multi-dimensional (up to rank 7) transforms and both Fortran and C interfaces for all transform functions.

Table "FFT Functions in Intel MKL" lists FFT functions implemented in Intel MKL:

FFT Functions in Intel MKL
Function Name	Operation
Descriptor Manipulation Functions
DftiCreateDescriptor	Allocates memory for the descriptor data structure and preliminarily initializes it.
DftiCommitDescriptor	Performs all initialization for the actual FFT computation.
DftiCopyDescriptor	Copies an existing descriptor.
DftiFreeDescriptor	Frees memory allocated for a descriptor.
FFT Computation Functions
DftiComputeForward	Computes the forward FFT.
DftiComputeBackward	Computes the backward FFT.
Descriptor Configuration Functions
DftiSetValue	Sets one particular configuration parameter with the specified configuration value.
DftiGetValue	Gets the value of one particular configuration parameter.
Status Checking Functions
DftiErrorClass	Checks if the status reflects an error of a predefined class.
DftiErrorMessage	Generates an error message.

Description of the FFT functions is followed by discussion of configuration settings (see Configuration Settings) and various configuration parameters used.