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Last change
on this file since 2759 was
2759,
checked in by aslmd, 2 years ago
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adding unmodified code from WRFV3.0.1.1, expurged from useless data +1M size
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File size:
2.0 KB
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| 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: cost1i.f,v 1.2 2004/06/15 21:14:57 rodney Exp $ |
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| 11 | ! |
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| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 13 | |
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| 14 | SUBROUTINE COST1I (N, WSAVE, LENSAV, IER) |
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| 15 | INTEGER N, LENSAV, IER |
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| 16 | REAL WSAVE(LENSAV) |
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| 17 | ! |
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| 18 | IER = 0 |
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| 19 | ! |
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| 20 | IF (LENSAV .LT. 2*N + INT(LOG(REAL(N))) +4) THEN |
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| 21 | IER = 2 |
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| 22 | CALL XERFFT ('COST1I', 3) |
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| 23 | GO TO 300 |
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| 24 | ENDIF |
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| 25 | ! |
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| 26 | IF (N .LE. 3) RETURN |
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| 27 | NM1 = N-1 |
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| 28 | NP1 = N+1 |
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| 29 | NS2 = N/2 |
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| 30 | PI = 4.*ATAN(1.) |
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| 31 | DT = PI/FLOAT(NM1) |
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| 32 | FK = 0. |
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| 33 | DO 101 K=2,NS2 |
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| 34 | KC = NP1-K |
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| 35 | FK = FK+1. |
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| 36 | WSAVE(K) = 2.*SIN(FK*DT) |
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| 37 | WSAVE(KC) = 2.*COS(FK*DT) |
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| 38 | 101 END DO |
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| 39 | LNSV = NM1 + INT(LOG(REAL(NM1))) +4 |
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| 40 | CALL RFFT1I (NM1, WSAVE(N+1), LNSV, IER1) |
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| 41 | IF (IER1 .NE. 0) THEN |
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| 42 | IER = 20 |
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| 43 | CALL XERFFT ('COST1I',-5) |
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| 44 | ENDIF |
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| 45 | 300 CONTINUE |
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| 46 | RETURN |
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| 47 | END |
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