| dft | The Discrete Fourier Transform |
| idft | The Inverse Discrete Fourier Transform |
| fft | The Centered Finite Fourier Transform |
| ifft | The Centered Finite Inverse Fourier Transform |
| dbldft | Forward Fourier Transform of a Double-Precision Vector |
| idbldft | Inverse Fourier Transform of a Double-Precision Vector |
| lombft | The Unevenly Spaced Lomb-Fourier Transform |
| fft2d | Two Dimensional Fourier Transform |
| ifft2d | Two Dimensional Inverse Fourier Transform |
| dft2d | Two Dimensional Discrete Fourier Transform |
| idft2d | Two Dimensional Inverse Discrete Fourier Transform |
| fftshift | Circular Shift That Centers a Discrete Fourier Transform |
