radb4.f
SUBROUTINE RADB4 (IDO, L1, CC, CH, WA1, WA2, WA3)
C***BEGIN PROLOGUE RADB4
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Warning: this routine is not intended to be user-callable.
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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