SUBROUTINE SINTI(N,WSAVE)
C***BEGIN PROLOGUE  SINTI
C***DATE WRITTEN   790601   (YYMMDD)
C***REVISION DATE  830401   (YYMMDD)
C***CATEGORY NO.  J1A3
C***KEYWORDS  FOURIER TRANSFORM
C***AUTHOR  SWARZTRAUBER, P. N., (NCAR)
C***PURPOSE  Initialize for SINT.
C***DESCRIPTION
C
C  Subroutine SINTI initializes the array WSAVE which is used in
C  subroutine SINT.  The prime factorization of N together with
C  a tabulation of the trigonometric functions are computed and
C  stored in WSAVE.
C
C  Input Parameter
C
C  N       the length of the sequence to be transformed.  The method
C          is most efficient when N+1 is a product of small primes.
C
C  Output Parameter
C
C  WSAVE   a work array with at least INT(3.5*N+16) locations.
C          Different WSAVE arrays are required for different values
C          of N.  The contents of WSAVE must not be changed between
C          calls of SINT.
C***REFERENCES  (NONE)
C***ROUTINES CALLED  RFFTI
C***END PROLOGUE  SINTI