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Last change
on this file since 5445 was
1999,
checked in by Laurent Fairhead, 11 years ago
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Merged trunk changes r1920:1997 into testing branch
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-
Property copyright set to
Name of program: LMDZ
Creation date: 1984
Version: LMDZ5
License: CeCILL version 2
Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539
See the license file in the root directory
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File size:
1.2 KB
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| 1 | SUBROUTINE SET99(TRIGS,IFAX,N) |
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| 2 | REAL TRIGS(N) |
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| 3 | INTEGER IFAX(*),JFAX(10),NLFAX(7) |
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| 4 | C |
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| 5 | C SUBROUTINE 'SET99' - COMPUTES FACTORS OF N & TRIGONOMETRIC |
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| 6 | C FUNCTIONS REQUIRED BY FFT99 & FFT991 |
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| 7 | C |
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| 8 | SAVE NLFAX |
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| 9 | C |
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| 10 | DATA NLFAX/6,8,5,4,3,2,1/ |
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| 11 | C |
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| 12 | IXXX=1 |
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| 13 | C |
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| 14 | DEL=4.0E0*ASIN(1.0E0)/FLOAT(N) |
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| 15 | NIL=0 |
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| 16 | NHL=(N/2)-1 |
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| 17 | DO 10 K=NIL,NHL |
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| 18 | ANGLE=FLOAT(K)*DEL |
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| 19 | TRIGS(2*K+1)=COS(ANGLE) |
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| 20 | TRIGS(2*K+2)=SIN(ANGLE) |
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| 21 | 10 CONTINUE |
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| 22 | C |
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| 23 | C FIND FACTORS OF N (8,6,5,4,3,2; ONLY ONE 8 ALLOWED) |
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| 24 | C LOOK FOR SIXES FIRST, STORE FACTORS IN DESCENDING ORDER |
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| 25 | NU=N |
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| 26 | IFAC=6 |
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| 27 | K=0 |
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| 28 | IL=1 |
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| 29 | 20 CONTINUE |
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| 30 | IF (MOD(NU,IFAC).NE.0) GO TO 30 |
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| 31 | K=K+1 |
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| 32 | JFAX(K)=IFAC |
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| 33 | IF (IFAC.NE.8) GO TO 25 |
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| 34 | IF (K.EQ.1) GO TO 25 |
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| 35 | JFAX(1)=8 |
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| 36 | JFAX(K)=6 |
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| 37 | 25 CONTINUE |
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| 38 | NU=NU/IFAC |
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| 39 | IF (NU.EQ.1) GO TO 50 |
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| 40 | IF (IFAC.NE.8) GO TO 20 |
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| 41 | 30 CONTINUE |
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| 42 | IL=IL+1 |
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| 43 | IFAC=NLFAX(IL) |
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| 44 | IF (IFAC.GT.1) GO TO 20 |
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| 45 | C |
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| 46 | WRITE(6,40) N |
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| 47 | 40 FORMAT(4H1N =,I4,27H - CONTAINS ILLEGAL FACTORS) |
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| 48 | RETURN |
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| 49 | C |
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| 50 | C NOW REVERSE ORDER OF FACTORS |
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| 51 | 50 CONTINUE |
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| 52 | NFAX=K |
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| 53 | IFAX(1)=NFAX |
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| 54 | DO 60 I=1,NFAX |
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| 55 | IFAX(NFAX+2-I)=JFAX(I) |
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| 56 | 60 CONTINUE |
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| 57 | IFAX(10)=N |
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| 58 | RETURN |
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| 59 | END |
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