SLATEC Routines --- RADB4 ---

*DECK RADB4
      SUBROUTINE RADB4 (IDO, L1, CC, CH, WA1, WA2, WA3)
C***BEGIN PROLOGUE  RADB4
C***SUBSIDIARY
C***PURPOSE  Calculate the fast Fourier transform of subvectors of
C            length four.
C***LIBRARY   SLATEC (FFTPACK)
C***TYPE      SINGLE PRECISION (RADB4-S)
C***AUTHOR  Swarztrauber, P. N., (NCAR)
C***ROUTINES CALLED  (NONE)
C***REVISION HISTORY  (YYMMDD)
C   790601  DATE WRITTEN
C   830401  Modified to use SLATEC library source file format.
C   860115  Modified by Ron Boisvert to adhere to Fortran 77 by
C           (a) changing dummy array size declarations (1) to (*),
C           (b) changing definition of variable SQRT2 by using
C               FORTRAN intrinsic function SQRT instead of a DATA
C               statement.
C   881128  Modified by Dick Valent to meet prologue standards.
C   890831  Modified array declarations.  (WRB)
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900402  Added TYPE section.  (WRB)
C***END PROLOGUE  RADB4