This section describes a collection of C and Fortran wrappers providing FFTW 2.x interface to Intel MKL. The wrappers translate calls to FFTW 2.x functions into the calls of the Intel MKL Fast Fourier Transform interface (FFT interface).
Note that Intel MKL FFT interface operates on both single- and double-precision floating-point data types.
Because of differences between FFTW and Intel MKL FFT functionalities, there are restrictions on using wrappers instead of the FFTW functions. Some FFTW functions have empty wrappers. However, many typical FFTs can be computed using these wrappers.
Refer to Fourier Transform Functions, for better understanding the effects from the use of the wrappers.