| [2759] | 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: cosqmf.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 COSQMF (LOT, JUMP, N, INC, X, LENX, WSAVE, LENSAV, & |
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| 15 | & WORK, LENWRK, IER) |
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| 16 | INTEGER LOT, JUMP, N, INC, LENX, LENSAV, LENWRK, IER |
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| 17 | REAL X(INC,*), WSAVE(LENSAV), WORK(LENWRK) |
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| 18 | LOGICAL XERCON |
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| 19 | ! |
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| 20 | IER = 0 |
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| 21 | ! |
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| 22 | IF (LENX .LT. (LOT-1)*JUMP + INC*(N-1) + 1) THEN |
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| 23 | IER = 1 |
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| 24 | CALL XERFFT ('COSQMF', 6) |
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| 25 | GO TO 300 |
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| 26 | ELSEIF (LENSAV .LT. 2*N + INT(LOG(REAL(N))) +4) THEN |
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| 27 | IER = 2 |
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| 28 | CALL XERFFT ('COSQMF', 8) |
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| 29 | GO TO 300 |
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| 30 | ELSEIF (LENWRK .LT. LOT*N) THEN |
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| 31 | IER = 3 |
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| 32 | CALL XERFFT ('COSQMF', 10) |
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| 33 | GO TO 300 |
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| 34 | ELSEIF (.NOT. XERCON(INC,JUMP,N,LOT)) THEN |
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| 35 | IER = 4 |
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| 36 | CALL XERFFT ('COSQMF', -1) |
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| 37 | GO TO 300 |
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| 38 | ENDIF |
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| 39 | ! |
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| 40 | LJ = (LOT-1)*JUMP+1 |
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| 41 | IF (N-2) 102,101,103 |
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| 42 | 101 SSQRT2 = 1./SQRT(2.) |
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| 43 | DO 201 M=1,LJ,JUMP |
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| 44 | TSQX = SSQRT2*X(M,2) |
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| 45 | X(M,2) = .5*X(M,1)-TSQX |
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| 46 | X(M,1) = .5*X(M,1)+TSQX |
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| 47 | 201 END DO |
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| 48 | 102 RETURN |
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| 49 | 103 CALL MCSQF1 (LOT,JUMP,N,INC,X,WSAVE,WORK,IER1) |
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| 50 | IF (IER1 .NE. 0) THEN |
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| 51 | IER = 20 |
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| 52 | CALL XERFFT ('COSQMF',-5) |
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| 53 | ENDIF |
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| 54 | ! |
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| 55 | 300 CONTINUE |
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| 56 | RETURN |
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| 57 | END |
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