| 1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 2 | ! |
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| 3 | ! FFTPACK 5.0 |
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| 4 | ! Copyright (C) 1995-2004, Scientific Computing Division, |
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| 5 | ! University Corporation for Atmospheric Research |
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| 6 | ! Licensed under the GNU General Public License (GPL) |
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| 7 | ! |
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| 8 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
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| 9 | ! |
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| 10 | ! $Id: cfft1b.f,v 1.2 2004/06/15 21:08:32 rodney Exp $ |
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| 11 | ! |
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| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 13 | |
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| 14 | SUBROUTINE CFFT1B (N, INC, C, LENC, WSAVE, LENSAV, & |
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| 15 | & WORK, LENWRK, IER) |
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| 16 | INTEGER N, INC, LENC, LENSAV, LENWRK, IER |
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| 17 | COMPLEX C(LENC) |
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| 18 | REAL WSAVE(LENSAV) ,WORK(LENWRK) |
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| 19 | ! |
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| 20 | IER = 0 |
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| 21 | ! |
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| 22 | IF (LENC .LT. INC*(N-1) + 1) THEN |
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| 23 | IER = 1 |
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| 24 | CALL XERFFT ('CFFT1B ', 6) |
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| 25 | ELSEIF (LENSAV .LT. 2*N + INT(LOG(REAL(N))) + 4) THEN |
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| 26 | IER = 2 |
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| 27 | CALL XERFFT ('CFFT1B ', 8) |
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| 28 | ELSEIF (LENWRK .LT. 2*N) THEN |
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| 29 | IER = 3 |
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| 30 | CALL XERFFT ('CFFT1B ', 10) |
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| 31 | ENDIF |
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| 32 | ! |
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| 33 | IF (N .EQ. 1) RETURN |
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| 34 | ! |
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| 35 | IW1 = N+N+1 |
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| 36 | CALL C1FM1B (N,INC,C,WORK,WSAVE,WSAVE(IW1), & |
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| 37 | & WSAVE(IW1+1)) |
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| 38 | RETURN |
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| 39 | END |
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