| 1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
|---|
| 2 | ! |
|---|
| 3 | ! FFTPACK 5.0 |
|---|
| 4 | ! Copyright (C) 1995-2004, Scientific Computing Division, |
|---|
| 5 | ! University Corporation for Atmospheric Research |
|---|
| 6 | ! Licensed under the GNU General Public License (GPL) |
|---|
| 7 | ! |
|---|
| 8 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
|---|
| 9 | ! |
|---|
| 10 | ! $Id: rfft1b.f,v 1.2 2004/06/15 21:29:20 rodney Exp $ |
|---|
| 11 | ! |
|---|
| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
|---|
| 13 | |
|---|
| 14 | SUBROUTINE RFFT1B ( N, INC, R, LENR, WSAVE, LENSAV, & |
|---|
| 15 | & WORK, LENWRK, IER) |
|---|
| 16 | INTEGER N, INC, LENR, LENSAV, LENWRK, IER |
|---|
| 17 | REAL R(LENR), WSAVE(LENSAV) ,WORK(LENWRK) |
|---|
| 18 | ! |
|---|
| 19 | IER = 0 |
|---|
| 20 | ! |
|---|
| 21 | IF (LENR .LT. INC*(N-1) + 1) THEN |
|---|
| 22 | IER = 1 |
|---|
| 23 | CALL XERFFT ('RFFT1B ', 6) |
|---|
| 24 | ELSEIF (LENSAV .LT. N + INT(LOG(REAL(N))) +4) THEN |
|---|
| 25 | IER = 2 |
|---|
| 26 | CALL XERFFT ('RFFT1B ', 8) |
|---|
| 27 | ELSEIF (LENWRK .LT. N) THEN |
|---|
| 28 | IER = 3 |
|---|
| 29 | CALL XERFFT ('RFFT1B ', 10) |
|---|
| 30 | ENDIF |
|---|
| 31 | ! |
|---|
| 32 | IF (N .EQ. 1) RETURN |
|---|
| 33 | ! |
|---|
| 34 | CALL RFFTB1 (N,INC,R,WORK,WSAVE,WSAVE(N+1)) |
|---|
| 35 | RETURN |
|---|
| 36 | END |
|---|
