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C
C Copyright (c) 1997 Silvano Bonazzola
C
C This file is part of LORENE.
C
C LORENE is free software; you can redistribute it and/or modify
C it under the terms of the GNU General Public License as published by
C the Free Software Foundation; either version 2 of the License, or
C (at your option) any later version.
C
C LORENE is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
C GNU General Public License for more details.
C
C You should have received a copy of the GNU General Public License
C along with LORENE; if not, write to the Free Software
C Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
C
C
SUBROUTINE TFINS(N,CC,CS,Y)
implicit double precision (a-h,o-z)
C
C **** ROUTINE TRANSFORMATION INVERSE DE FOURIER.
C ***** LES DIMENSIONS MINIMUN POUR LES TABLEAUX SONT N+1 POUR CC ET CS
C**** F DOIT AVOIR COMME DIMENSION N+3
C *** LES ARGUMENS DE LA ROUINE SONT: N NOMBRE DES POINTS D'ECHAN-
C *** TILLONAGE,(=2**m*3**l*5**j),
C *** CC COMPOS.COSINUS,CS COMP.SINUS DE LA TRANSFORMEE DE FOURIER
C *** Y FONCTION OUTPUT.
C
C Routine testee le 10/9/1975.
C
C
C $Id: tfins.f,v 1.2 2012/03/30 12:12:44 j_novak Exp $
C $Log: tfins.f,v $
C Revision 1.2 2012/03/30 12:12:44 j_novak
C Cleaning of fortran files
C
C Revision 1.1.1.1 2001/11/20 15:19:30 e_gourgoulhon
C LORENE
C
c Revision 1.2 1997/05/23 11:37:24 hyc
c *** empty log message ***
c
C Revision 1.1 1997/05/08 07:39:13 hyc
C Initial revision
C
C
C $Header: /cvsroot/Lorene/F77/Source/Poisson2d/tfins.f,v 1.2 2012/03/30 12:12:44 j_novak Exp $
C
C
character*120 header
data header/'$Header: /cvsroot/Lorene/F77/Source/Poisson2d/tfins.f,v 1.2 2012/03/30 12:12:44 j_novak Exp $'/
DIMENSION TRIGS(1600),IFAX(40),CC(*),CS(*),AC(7,12),AS(7,12)
DIMENSION Y(*)
data ndim/-1/
save N2,N1,N21,NDIM,AC,AS,ifax,trigs
IF(N.LT.1033) GO TO 10
PRINT 110,N
110 FORMAT(10X,'N=',I4,'. N DOIT ETRE < 1033')
CALL EXIT
10 CONTINUE
IF(NDIM.EQ.N) GO TO 20
CALL FAX(IFAX,N,3)
CALL FFTRIG(TRIGS,N,3)
N2=N/2
N1=N+1
N21=N2+1
C
NDIM=N
300 FORMAT(10X,'LA SUB TF EST APPELLEE POUR LA PREMIERE FOIS')
C
C PREPARATION DE LA MATRICE D'INVERSION DANS LE CAS
C DE N<13.
C
IF(N.GT.12) GO TO 20
X0=0
PIG=4*ACOS(X0)/N
DO 31 L=1,N
PIGL=PIG*(L-1)
DO 30 J=2,N21
J1=J-1
AC(J,L)=COS(PIGL*J1)
AS(J,L)=SIN(PIGL*J1)
30 CONTINUE
31 CONTINUE
DO 32 L=1,N
AC(1,L)=.5
AC(N21,L)=AC(N21,L)*.5
32 CONTINUE
20 CONTINUE
IF(N.LT.13) GO TO 21
C
C TF INVERSE POUR N>12.
C
DO 33 L=1,N2
L2=L+L
L1=L2-1
Y(L1)=CC(L)
Y(L2)=-CS(L)
33 CONTINUE
Y(N1)=CC(N21)
CALL FFT991(Y,CC,TRIGS,IFAX,1,1,N,1,1)
DO 34 L=1,N
Y(L)=Y(L)*.5D+00
34 CONTINUE
100 FORMAT(1X,'TF',10D12.4)
RETURN
C
C CALCUL DE LA TF INVERSE DANS LE CAS DE N<13.
C
21 CONTINUE
301 FORMAT(10X,'CALCUL DANS LE CAS N<13')
DO 36 L=1,N
SOM=CC(1)*AC(1,L)+CC(N21)*AC(N21,L)
DO 35 J=2,N2
SOM=SOM+CC(J)*AC(J,L)+CS(J)*AS(J,L)
35 CONTINUE
Y(L)=SOM
36 CONTINUE
RETURN
END
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