R = a range
INVFFT generates the inverse Discrete Fourier Transform or range R using a Fast Fourier Transform algorithm. The length of the vector must be a power of 2. INVFFT will produce the same results as INVDFT, but it is much faster () time as opposed to time).
Matrix A1..B4 =
INVFFT(A1..F3) = Error - INVFFT, dimension must be power of 2
Excel function: N/A