1 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
4 ! Copyright (C) 1995-2004, Scientific Computing Division,
5 ! University Corporation for Atmospheric Research
6 ! Licensed under the GNU General Public License (GPL)
8 ! Authors: Paul N. Swarztrauber and Richard A. Valent
10 ! $Id: cfft2f.f,v 1.2 2004/06/15 21:08:32 rodney Exp $
12 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
14 SUBROUTINE CFFT2F (LDIM, L, M, C, WSAVE, LENSAV, &
16 INTEGER L, M, LDIM, LENSAV, LENWRK, IER
18 REAL WSAVE(LENSAV), WORK(LENWRK)
20 ! Initialize error return
26 CALL XERFFT ('CFFT2F', -2)
28 ELSEIF (LENSAV .LT. 2*L + INT(LOG(REAL(L))) + &
29 & 2*M + INT(LOG(REAL(M))) +8) THEN
31 CALL XERFFT ('CFFT2F', 6)
33 ELSEIF (LENWRK .LT. 2*L*M) THEN
35 CALL XERFFT ('CFFT2F', 8)
39 ! Transform X lines of C array
40 IW = 2*L+INT(LOG(REAL(L))*LOG(2.)) + 3
41 CALL CFFTMF(L, 1, M, LDIM, C, (L-1) + LDIM*(M-1) +1, &
42 & WSAVE(IW), 2*M + INT(LOG(REAL(M))) + 4, &
46 CALL XERFFT ('CFFT2F',-5)
50 ! Transform Y lines of C array
52 CALL CFFTMF (M, LDIM, L, 1, C, (M-1)*LDIM + L, &
53 & WSAVE(IW), 2*L + INT(LOG(REAL(L))) + 4, &
57 CALL XERFFT ('CFFT2F',-5)