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Commit | Line | Data |
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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:21:26 cernlib | |
6 | * Geant | |
7 | * | |
8 | * | |
9 | #include "geant321/pilot.h" | |
10 | *CMZ : 3.21/02 29/03/94 15.41.22 by S.Giani | |
11 | *-- Author : | |
12 | SUBROUTINE GMOL4(Y,X,VAL,ARG,EPS,IER) | |
13 | C. | |
14 | C. ****************************************************************** | |
15 | C. * * | |
16 | C. * ROUTINE TAKEN FROM IBM SCIENTIFIC SUBROUTINE PACKAGE * | |
17 | C. * * | |
18 | C. * 4 POINT CONTINUED FRACTION INTERPOLATION * | |
19 | C. * Y=INTERPOLATED VALUE FOR THE ARGUMENT X . * | |
20 | C. * VAL=VALUE ARRAY . * | |
21 | C. * ARG=ARGUMENT ARRAY . * | |
22 | C. * EPS=DESIRED ACCURACY . * | |
23 | C. * OUTPUT ERROR PARAMETER IER = 0 ACCURACY O.K. * | |
24 | C. * = 1 ACCURACY CAN NOT BE TESTED * | |
25 | C. * IN 4TH ORDER INTERPOLATION . * | |
26 | C. * = 2 TWO IDENTICAL ELEMENTS IN THE * | |
27 | C. * ARGUMENT ARRAY . * | |
28 | C. * * | |
29 | C. * ==>Called by : GMOLIE * | |
30 | C. * Author M.S. Dixit NRCC Ottawa ********* * | |
31 | C. * * | |
32 | C. ****************************************************************** | |
33 | C. | |
34 | DIMENSION ARG(4),VAL(4) | |
35 | C. | |
36 | C. ------------------------------------------------------------------ | |
37 | C. | |
38 | IER=1 | |
39 | Y=VAL(1) | |
40 | P2=1. | |
41 | P3=Y | |
42 | Q2=0. | |
43 | Q3=1. | |
44 | DO 16 I=2,4 | |
45 | II=0 | |
46 | P1=P2 | |
47 | P2=P3 | |
48 | Q1=Q2 | |
49 | Q2=Q3 | |
50 | Z=Y | |
51 | JEND=I-1 | |
52 | 3 AUX=VAL(I) | |
53 | DO 10 J=1,JEND | |
54 | H=VAL(I)-VAL(J) | |
55 | IF(ABS(H).GT.1.E-6*ABS(VAL(I)))GO TO 9 | |
56 | IF(ARG(I).EQ.ARG(J))GO TO 17 | |
57 | IF(J.LT.JEND)GO TO 8 | |
58 | II=II+1 | |
59 | III=I+II | |
60 | IF(III.GT.4)GO TO 19 | |
61 | VAL(I)=VAL(III) | |
62 | VAL(III)=AUX | |
63 | AUX=ARG(I) | |
64 | ARG(I)=ARG(III) | |
65 | ARG(III)=AUX | |
66 | GO TO 3 | |
67 | 8 VAL(I)=1.E36 | |
68 | GO TO 10 | |
69 | 9 VAL(I)=(ARG(I)-ARG(J))/H | |
70 | 10 CONTINUE | |
71 | P3=VAL(I)*P2+(X-ARG(I-1))*P1 | |
72 | Q3=VAL(I)*Q2+(X-ARG(I-1))*Q1 | |
73 | IF(Q3.NE.0.)THEN | |
74 | Y=P3/Q3 | |
75 | ELSE | |
76 | Y=1.E36 | |
77 | ENDIF | |
78 | DELT=ABS(Z-Y) | |
79 | IF(DELT.LE.EPS)GO TO 19 | |
80 | 16 CONTINUE | |
81 | RETURN | |
82 | 17 IER=2 | |
83 | RETURN | |
84 | 19 IER=0 | |
85 | END |