A' on exit.

</PRE>
<B>Input/Output Parameters</B>
<PRE>
  N       (input) INTEGER
          Number of real samples. N must be a power of 2.
          N &gt;= 0.

  A       (input/output) DOUBLE PRECISION array, dimension (N)
          On entry with SCR = 'N' or SCR = 'O', this array must
          contain the input signal.
          On entry with SCR = 'I', this array must contain the
          bit-reversed input signal.
          On exit with SCR = 'N' or SCR = 'I', this array contains
          the Hartl