*DECK SINQI
SUBROUTINE SINQI (N, WSAVE)
C***BEGIN PROLOGUE SINQI
C***PURPOSE Initialize a work array for SINQF and SINQB.
C***LIBRARY SLATEC (FFTPACK)
C***CATEGORY J1A3
C***TYPE SINGLE PRECISION (SINQI-S)
C***KEYWORDS FFTPACK, FOURIER TRANSFORM
C***AUTHOR Swarztrauber, P. N., (NCAR)
C***DESCRIPTION
C
C Subroutine SINQI initializes the array WSAVE which is used in
C both SINQF and SINQB. 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 is a product of small primes.
C
C Output Parameter
C
C WSAVE a work array which must be dimensioned at least 3*N+15.
C The same work array can be used for both SINQF and SINQB
C as long as N remains unchanged. Different WSAVE arrays
C are required for different values of N. The contents of
C WSAVE must not be changed between calls of SINQF or SINQB.
C
C***REFERENCES P. N. Swarztrauber, Vectorizing the FFTs, in Parallel
C Computations (G. Rodrigue, ed.), Academic Press,
C 1982, pp. 51-83.
C***ROUTINES CALLED COSQI
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 changing dummy array size declarations (1) to (*)
C 861211 REVISION DATE from Version 3.2
C 881128 Modified by Dick Valent to meet prologue standards.
C 891214 Prologue converted to Version 4.0 format. (BAB)
C 920501 Reformatted the REFERENCES section. (WRB)
C***END PROLOGUE SINQI
DIMENSION WSAVE(*)
C***FIRST EXECUTABLE STATEMENT SINQI
CALL COSQI (N,WSAVE)
RETURN
END