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N=2 FFT module

A FORTRAN implementation of a length-2 FFT module (Butterfly) to be used in a Prime Factor Algorithm program or other FFT program. In Place version.

C
C----------------WFTA N=2--------------------------------
C
102 R1    = A(1)
    A(1)  = R1 + A(2)
    A(2)  = R1 - A(2)
C
    R1   = B(1)
    B(1) = R1 + B(2)
    B(2) = R1 - B(2)
C
    GOTO 20
 
Figure.  Length-2 FFT Module

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