| fe4da5cc |
1 | * |
| 2 | * $Id$ |
| 3 | * |
| 4 | * $Log$ |
| 5 | * Revision 1.1.1.1 1995/10/24 10:21:38 cernlib |
| 6 | * Geant |
| 7 | * |
| 8 | * |
| 9 | #include "geant321/pilot.h" |
| 10 | *CMZ : 3.21/02 29/03/94 15.41.25 by S.Giani |
| 11 | *-- Author : |
| 12 | FUNCTION GPSCIN(EBEG,EEND,ECUR,COEFF) |
| 13 | C. |
| 14 | C. ****************************************************************** |
| 15 | C. * * |
| 16 | C. ****************************************************************** |
| 17 | C. |
| 18 | #if !defined(CERNLIB_SINGLE) |
| 19 | IMPLICIT DOUBLE PRECISION (A-H,O-Z) |
| 20 | #endif |
| 21 | REAL COEFF(4) |
| 22 | PARAMETER (ONE=1) |
| 23 | C. |
| 24 | C. ------------------------------------------------------------------ |
| 25 | C. |
| 26 | YBEG = EBEG/ECUR |
| 27 | YEND = EEND/ECUR |
| 28 | YBEGIN = ONE/YBEG |
| 29 | YENDIN = ONE/YEND |
| 30 | * |
| 31 | EINV = ONE/ECUR |
| 32 | C1 = COEFF(1)*EINV |
| 33 | C2 = COEFF(2)*EINV**2 |
| 34 | C3 = COEFF(3)*EINV**3 |
| 35 | C4 = COEFF(4)*EINV**4 |
| 36 | * |
| 37 | CONS1 = 0.5*(C1+C3) |
| 38 | CONS2 = C2+C4 |
| 39 | CONS3 = 0.5*CONS2 |
| 40 | CONS4 = 0.5*C3 |
| 41 | CONS5 = C4/3 |
| 42 | * |
| 43 | * VALBEG = CONS1*F1(YBEG)+CONS3*F2(YBEG)+ |
| 44 | * + YBEGIN*(CONS2+YBEGIN*(CONS4+YBEGIN*CONS5)) |
| 45 | * VALEND = CONS1*F1(YEND)+CONS3*F2(YEND)+ |
| 46 | * + YENDIN*(CONS2+YENDIN*(CONS4+YENDIN*CONS5)) |
| 47 | * |
| 48 | * GPSCIN = VALEND-VALBEG |
| 49 | GPSCIN = |
| 50 | + CONS1*LOG(ABS((YEND**2-1)*YBEG**2/((YBEG**2-1)*YEND**2)))+ |
| 51 | + CONS2*(YENDIN-YBEGIN)+ |
| 52 | + CONS3*LOG(ABS((1-YEND)*(1+YBEG)/((1-YBEG)*(1+YEND))))+ |
| 53 | + CONS4*(YENDIN**2-YBEGIN**2)+CONS5*(YENDIN**3-YBEGIN**3) |
| 54 | * |
| 55 | END |
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