|   | Name | Description | 
|---|
   | RealFFT(Double, FourierDirection) | 
            Does a real-valued fourier transform of 'n' points of the
            'real' array.  On forward transform, the real part of the transform ends
            up in the first half of the array and the imaginary part of the
            transform ends up in the second half of the array. On backward transform, real and imaginary part
            have to be located in the same way like the result of the forward transform.
             | 
   | RealFFT(Double, Int32) | 
                 Does a real-valued fourier transform of 'n' points of the
                 'real' array.  The real part of the transform ends
                 up in the first half of the array and the imaginary part of the
                 transform ends up in the second half of the array.
             | 
   | RealFFT(Double, Int32, FourierDirection) | 
            Does a real-valued fourier transform of 'n' points of the
            'real' array.  On forward transform, the real part of the transform ends
            up in the first half of the array and the imaginary part of the
            transform ends up in the second half of the array. On backward transform, real and imaginary part
            have to be located in the same way like the result of the forward transform.
             |