有偿，求帮忙解释Fortran代码！

hongxing

各位大佬，新人小白有偿相求帮助，帮忙解释一下Fortran代码（和物理中射线追踪相关），如果大佬懂python就更好了！！！

necrohan

002          C        CALCULATES ELECTRON DENSITY AND GRADIENT FROM ACQUIRED         ELECTX02
003          C        PROFILES PERFORMING A POLINOMIAL INTERPOLATION                 ELECTX03
我不是这个专业的，但是你看注释已经说了

hongxing

有没有大佬，帮忙看下这个代码在做啥呀

[Fortran] 纯文本查看 复制代码

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001	SUBROUTINE ELECTX                                                 ELECTX01

002	C        CALCULATES ELECTRON DENSITY AND GRADIENT FROM ACQUIRED         ELECTX02

003	C        PROFILES PERFORMING A POLINOMIAL INTERPOLATION                 ELECTX03

004	C ******************************************************************************

005

006	DIMENSION FN2C(600,10,25)

007	DIMENSION COE(4),XA(4),YA(4)

008	DIMENSION ALPHA(600),BETA(600),GAMMA(600)

009	C      DIMENSION ALPHA(600),BETA(600),GAMMA(600),DELTA(600)

010

011	SAVE ALPHA,BETA,GAMMA

012	C      SAVE ALPHA,BETA,GAMMA,DELTA

013

014	COMMON /ALEX2/ NOC,HPC(600),FNC(600,10,25)                                GPROF000

015	COMMON /ZZZZ/ ZZLAT,ZZLON,JLAT,JLON                                       LATLON00

016	SAVE LATOLD,LONOLD                                                        LATLON00

017

018	C ******************************************************************************

019	C      EQUIVALENCE (XMTRH,W(3)),(RCVRH,W(20))                            ELECTX04

020	C ******************************************************************************

021

022	COMMON /CONST/ PI,PIT2,PID2,DEGS,RAD,K,C,LOGTEN                   ELECTX05

023	COMMON /XX/ MODX(2),X,PXPR,PXPTH,PXPPH,PXPT,HMAX                  ELECTX06

024	COMMON R(20),T,STP,DRDT(20),N2                                    ELECTX07

025	COMMON /WW/ ID,W0,W(400)                                          ELECTX08

026	EQUIVALENCE (EARTHR,W(2)),(F,W(6)),(PVOLTA,W(100)),(PERT,W(150))  ELECTX09

027	C      REAL K                                                            ELECTX10

028	C ******************************************************************************

029

030	F2=F*F                                                            ELECTX11

031	MODX(1)=4HGRID                                                    ELECTX12

032	IF(PVOLTA.EQ.0.) GO TO 32                                         ELECTX13

033	PVOLTA=0.                                                         ELECTX14

034	LATOLD=-1.                                                        ELECTX15

035	LONOLD=-1.                                                        ELECTX16

036	C ******************************************************************************

037	C     ALEX: Lettura file 'GRIDPROFILES.txt',

038	C           scrittura file 'GRIDPROFILES_TEST.txt',

039	C           inizializzazione matrice per "plasma frequency profiles" FNC(K,J,I)

040	C ******************************************************************************

041	CALL GRIDPROFILES                                                         GPROF000

042	C ******************************************************************************

043	32 ZZLAT=DEGS*(PID2-R(2))                                            ELECTX17

044	ZZLON=DEGS*R(3)                                                   ELECTX18

045	CALL LATLON                                                       ELECTX19

046	IF(JLAT.EQ.LATOLD.AND.JLON.EQ.LONOLD) GO TO 33                    ELECTX20

047	IF (JLAT.NE.LATOLD) LATOLD=JLAT                                   ELECTX21

048	IF (JLON.NE.LONOLD) LONOLD=JLON                                   ELECTX22

049	C ******  FIND A PARAMETER TO EXTRAPOLATE THE ELECTRONIC DENSITY   *****ELECTX23

050	C ******  (BOTTOM PROFILE) NORMALIZE ITS VALUES TO OBTAIN X*F2     *****ELECTX24

051	C ******   FIND THE HEIGHT OF THE MAXIMUM                ***************ELECTX25

052	C      IF(FN2C(1,JLAT,JLON).NE.0.)                                               GPROF000

053	C     1A=ALOG(FN2C(2,JLAT,JLON)/FN2C(1,JLAT,JLON))/(HPC(2)-HPC(1))               GPROF000

054	NMAX=1                                                            ELECTX26

055	DO NH=1,NOC

056	C      FN2C(NH,JLAT,JLON)=K*FN2C(NH,JLAT,JLON)                                   GPROF000

057	FN2C(NH,JLAT,JLON)=FNC(NH,JLAT,JLON)**2                                   GPROF000

058

059	IF (FNC(NH,JLAT,JLON).GT.FNC(NMAX,JLAT,JLON)) NMAX=NH                     GPROF000

060	IF (NH.EQ.NOC) GO TO 4

061

ENDDO

062	C*******************************************************************************

063	C     POLINOMIAL INTERPOLATION IN THE INTERVAL OF VALUES FN2C

064	C*******************************************************************************

065	4 DO 10 I=1,NOC-3

066	DO 22 MP=1,4

067	XA(MP)=HPC(I+MP-1)                                                        GPROF000

068	C      YA(MP)=FN2C(I+MP-1)                                                       GPROF000

069	C ******************************************************************************

070	YA(MP)=FN2C(I+MP-1,JLAT,JLON)                                             GPROF000

071	C ******************************************************************************

072	22 CONTINUE

073	CALL POLCOE (XA,YA,3,COE)

074	C      CALL POLCOE (XA,YA,4,COE)

075	ALPHA(I)=COE(1)

076	BETA(I)=COE(2)

077	GAMMA(I)=COE(3)

078	C      DELTA(I)=COE(4)

079	C      WRITE(6,1707)I,ALPHA(I),BETA(I),GAMMA(I),DELTA(I)

080	C 1707 FORMAT (1X,I4,4(2X,E20.10))

081	10 CONTINUE

082	C ******************************************************************************

083	HMAX=HPC(NMAX)                                                    ELECTX27

084	33 H=R(1)-EARTHR                                                     ELECTX28

085	PXPR=0.                                                           ELECTX29

086	IF (H.GE.HPC(1)) GO TO 12                                         ELECTX30

087	X=0.                                                              ELECTX31

088	C      IF(FN2C(1,JLAT,JLON).EQ.0.) GO TO 50                                      GPROF000

089	C      X=FN2C(1,JLAT,JLON)*EXP(A*(H-HPC(1)))/F2                                  GPROF000

090	C      PXPR=A*X                                                          ELECTX32

091	GO TO 50                                                          ELECTX33

092	12 IF (H.GE.HPC(NOC)) GO TO 18                                       ELECTX34

093	NH=2                                                              ELECTX35

094	NSTEP=1                                                           ELECTX36

095	IF (H.LT.HPC(NH-1)) NSTEP=-1                                      ELECTX37

096	15 IF (HPC(NH-1).LE.H.AND.H.LT.HPC(NH)) GO TO 16                     ELECTX38

097	NH=NH+NSTEP                                                       ELECTX39

098	GO TO 15                                                          ELECTX40

099	C ******************************************************************************

100	C     LINEAR INTERPOLATION IN THE INTERVAL FN2C(K-1,J,I) AND FN2C(K,J,I)

101	C ******************************************************************************

102	C   16 X=(ALPHA(NH-1)+BETA(NH-1)*H)/F2

103	C      PXPR=(BETA(NH-1))/F2

104	C ******************************************************************************

105	C     POLINOMIAL INTERPOLATION IN THE INTERVAL FN2C(K-1,J,I) AND FN2C(K,J,I)

106	C ******************************************************************************

107	16 X=(ALPHA(NH-1)+BETA(NH-1)*H+GAMMA(NH-1)*H**2)/F2

108	PXPR=(BETA(NH-1)+H*(2.*GAMMA(NH-1)))/F2

109	C   16 X=(ALPHA(NH-1)+BETA(NH-1)*H+GAMMA(NH-1)*H**2+DELTA(NH-1)*H**3)/F2

110	C      PXPR=(BETA(NH-1)+H*(2.*GAMMA(NH-1))+H**2*(3.*DELTA(NH-1)))/F2

111	C ******************************************************************************

112

113	GO TO 50                                                          ELECTX41

114	18 X=FN2C(NOC,JLAT,JLON)/F2                                                  GPROF000

115	50 IF (PERT.NE.0.) CALL ELECT1                                       ELECTX42

116

117	C      IF (X.EQ.0..AND.H.GE.RCVRH) PRINT 1234, R(1),R(2),R(3)            ELECTX43

118	IF (X.EQ.0.) PRINT 1234, R(1),R(2),R(3)                                   AZZ

119	C*******************************************************************************

120

121	1234 FORMAT (3(2X,F20.10))                                             ELECTX44

122	WRITE(6,1704) R(1),R(2),R(3),R(4),R(5),R(6)                       ELECTX45

123	1704 FORMAT (6(2X,F20.10))                                             ELECTX46

124	RETURN                                                            ELECTX47

125

END