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Ò»¸öfortran 90³ÌÐòÈçÏ£º program D3R1 !driver for routine TRAPZD real,parameter::nmax=15,pio2=1.5707963 external Func,Fint real::A=0.0,B=pio2 write(*,'(1x,a)') 'integral of Func with 2^(n-1) points' write(*,'(1x,a,f10.6)')'actual value of integral is',& Fint(B)-Fint(A) write(*,'(1x,t7,a,t16,a)')'n','Approx.integral' do i=1,nmax call TRAPZD(Func,A,B,s,i) write(*,'(1x,i6,f20.6)')i,s end do end program D3R1 Function Func(x) Func=(x**2)*(x**2-2.0)*sin(x) end function Func function Fint(x) !integral of Func Fint=4.0*x*((x**2)-7.0)*sin(x)-((x**4)-14.0*(x**2)+28.0)*cos(x) end function Fint subroutine TRAPZD(Func,A,B,s,n) integer,parameter::k1=selected_int_kind(9) integer(kind=k1)::tnm integer,parameter::k2=selected_real_kind(8,13) real(kind=k2)::del,sum,x if(n==1)then s=0.5*(b-a)*(Func(a)+Func(b)) else tnm=2**(n-1) del=(b-a)/tnm x=A sum=0.0 do j=2,tnm x=x+del sum=sum+Func(x) end do s=0.5*(Func(A)+Func(B)+2.0*sum)*del end if end subroutine TRAPZD ÔËÐкó½á¹û£º integral of Func with 2^(n-1) points actual value of integral is -0.479158 n Approx.integral 1 0.905772 2 6.166170 3 -Infinity 4 -Infinity 5 -Infinity 6 NaN 7 NaN 8 NaN 9 NaN 10 NaN run-time error M6201: MATH - sin: DOMAIN error Image PC Routine Line Source pp.exe 00407039 Unknown Unknown Unknown pp.exe 00406E6B Unknown Unknown Unknown pp.exe 00406FF1 Unknown Unknown Unknown pp.exe 00409268 Unknown Unknown Unknown pp.exe 00429F90 Unknown Unknown Unknown pp.exe 00426CFC Unknown Unknown Unknown pp.exe 004012A6 Unknown Unknown Unknown pp.exe 00401451 Unknown Unknown Unknown pp.exe 004011E5 Unknown Unknown Unknown pp.exe 00433E29 Unknown Unknown Unknown pp.exe 00426234 Unknown Unknown Unknown kernel32.dll 7C817067 Unknown Unknown Unknown Incrementally linked image--PC correlation disabled. ÎÊÌ⣺ £¨1£©ÔõÑù½â¾öÔËÐкó³öÏÖµÄÇé¿ö£¨ÈçÉÏ£© £¨2£©Óï¾ä£ºinteger,parameter::k1=selected_int_kind(9)ÖÐÈô½«9¸ÄΪ13½«»á³öÏÖ·µ»ØÖµk1=-1£¬ÔõÑù½â¾ö£¿ (3)½«Óï¾ä:integer,parameter::k2=selected_real_kind(8,13)ÖÐ(8,13¸ÄΪ(6,9)ºóÔËÐнá¹û: integral of Func with 2^(n-1) points actual value of integral is -0.479158 n Approx.integral 1 0.905772 2 -0.020945 3 -0.361461 4 -0.449584 5 -0.471756 6 -0.477307 7 -0.478697 8 -0.479042 9 -0.479126 10 -0.479146 11 -0.479151 12 -0.479152 13 -0.479153 14 -0.479411 15 -0.479676 Press any key to continue ΪºÎÔÚ 14 -0.479411 15 -0.479676 ´¦±ä´óÄÇô¶à?²»ÊÇnÔ½´ó×îºóµÄÖµÔ½½Ó½üÕæÊµÖµÂð? [ Last edited by jianchaoyv on 2009-4-10 at 16:57 ] |
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- ¹ó±ö: 0.17
- ½ð±Ò: 4774.1
- É¢½ð: 8
- ºì»¨: 42
- Ìû×Ó: 1361
- ÔÚÏß: 215.2Сʱ
- ³æºÅ: 659094
- ×¢²á: 2008-11-21
- רҵ: ½ðÊô½á¹¹²ÄÁÏ
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kuhailangyu(½ð±Ò+3,VIP+0):Ìæ³æÓÑÖÂл£¡ 4-10 20:13
kuhailangyu(½ð±Ò+3,VIP+0):Ìæ³æÓÑÖÂл£¡ 4-10 20:13
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integer,parameter::k1=selected_int_kind(9) integer(kind=k1)::tnm integer,parameter::k2=selected_real_kind(8,13) real(kind=k2)::del,sum,x Õ⼸¾ä±íÃ÷ÁËtnm, del,sum, xµÄÀàÐÍ£¨ºóÈý¸öÊÇË«¾«¶ÈµÄ£¬8×ֽڵĸ¡µãÊý£¬Ï൱ÓÚreal*8£© Äãµ÷ÓÃÁËFunc(x)£¬µ«ÔÚFuncº¯ÊýÖÐûÓÐ˵Ã÷xµÄÀàÐÍ£¬Ä¬ÈÏÔòΪ4×Ö½Ú¸¡µãÊý£¬Ï൱ÓÚreal*4¡£ÕâÑùÀàÐͲ»Æ¥Å䣬¿ÉÄÜÊÇÔì³Écos»òSinº¯Êý³öÏÖÎÊÌâµÄÔÒò¡£ ÄãºóÀ´µÄÐ޸쬵ÈÓÚÊǰѲÎÊý¶¼¸Ä³Éµ¥¾«¶È£¬ÕâÑùËðʧÁ˾«¶È£¬¼ÆË㲻׼ȷ¡£ ¼òµ¥µÄ·½·¨ÊÇÔÚFunc(x)ÖмÓÉÏÒ»ÐÐ˵Ã÷£º real*8::x »òÕßΪÁ˱£³Öͳһ£¬¼ÓÉÏÁ½ÐÐ˵Ã÷£º integer,parameter::k2=selected_real_kind(8,13) real£¨kind=k2)::x Ò²ÐС£ ÕâÑùÔËÐгÌÐò£¬¾ÍºÃ¶àÁË¡£½á¹ûΪ£º integral of Func with 2^(n-1) points actual value of integral is -0.479158 n Approx.integral 1 0.000000 2 -0.473831 3 -0.587905 4 -0.562805 5 -0.528367 6 -0.505613 7 -0.492849 8 -0.486120 9 -0.482668 10 -0.480921 11 -0.480042 12 -0.479601 13 -0.479380 14 -0.479269 15 -0.479214 Õ⻹¿ÉÄܲ»ÊÇ×îºÃµÄ£¬ÒòΪ»¹ÓвÎÊýa, b µÄÎÊÌâ¡£ÎÒ½¨ÒéÄã×îºÃ°ÑÔÚÖ÷³ÌÐòºÍ×Ó³ÌÐòÖÐËùÓеĸ¡µãÊý£¨°üÀ¨a£¬b µÈ£©¶¼ËµÃ÷³ÉË«¾«¶ÈÊý£¬¿ÉÄÜ»á¸üºÃ¡£ ×¢£ºÎÒûÓп¼²éÄãµÄËã·¨£¬²»ÖªµÀ½á¹û¶Ô²»¶Ô£¬µ«ÊÇ´Ó±à³ÌÀ´½²£¬Êý¾ÝÀàÐÍÒª¾¡Á¿Í³Ò»ÊÇû´íµÄ¡£ºÇºÇ¡£ [ Last edited by ÀÏ»¢´óÍõ on 2009-4-10 at 20:14 ] |
2Â¥2009-04-10 20:12:12
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ľ³æ (ÖøÃûдÊÖ)
- Ó¦Öú: 26 (СѧÉú)
- ¹ó±ö: 0.17
- ½ð±Ò: 4774.1
- É¢½ð: 8
- ºì»¨: 42
- Ìû×Ó: 1361
- ÔÚÏß: 215.2Сʱ
- ³æºÅ: 659094
- ×¢²á: 2008-11-21
- רҵ: ½ðÊô½á¹¹²ÄÁÏ
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jianchaoyv(½ð±Ò+3,VIP+0):ÎÊÌâûȫ²¿½â¾ö,µ«ÊǷdz£¸ÐлÄãÕâλ¾ø¶ÔÊǸßÊÖÁË!!! 4-10 21:25
jianchaoyv(½ð±Ò+3,VIP+0):ÎÊÌâûȫ²¿½â¾ö,µ«ÊǷdz£¸ÐлÄãÕâλ¾ø¶ÔÊǸßÊÖÁË!!! 4-10 21:25
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Ë÷ÐÔÎÒ¸øÄãŪÁË£º ³ÌÐò¸ÄΪ£º program D3R1 !driver for routine TRAPZD integer,parameter::nmax=15 £¡ÕâÀïÓи͝ real*8,parameter::pio2=1.5707963 £¡ÕâÀïÓиģ¬ÇëÄã×Ô¼ºÔÙ°ÑPiO2д׼ȷһµã£¬¿ÉÄÜ»á¸üºÃ external Func,Fint real*8 ::A=0.0,B=pio2 £¡ÕâÀïÓÐ¸Ä write(2,'(1x,a)') 'integral of Func with 2^(n-1) points' write(2,'(1x,a,f10.6)')'actual value of integral is',& Fint(B)-Fint(A) write(2,'(1x,t7,a,t16,a)')'n','Approx.integral' do i=1,nmax call TRAPZD(Func,A,B,s,i) write(2,'(1x,i6,f20.6)')i,s end do end program D3R1 Function Func(x) real*8::x £¡ÕâÀï¸ÄÁË real*8::Func £¡ÕâÀï¸ÄÁË Func=(x**2)*(x**2-2.0)*sin(x) end function Func function Fint(x) !integral of Func real*8::x £¡ÕâÀï¸ÄÁË real*8::Fint £¡ÕâÀï¸ÄÁË Fint=4.0*x*((x**2)-7.0)*sin(x)-((x**4)-14.0*(x**2)+28.0)*cos(x) end function Fint subroutine TRAPZD(Func,A,B,s,n) integer,parameter::k1=selected_int_kind(9) integer(kind=k1)::tnm integer,parameter::k2=selected_real_kind(8,13) real*8::del,sum,x ,a,b !(kind=k2) £¡ÕâÀïËäÈ»¸ÄÁË£¬ÆäʵÊÇÒ»ÑùµÄ if(n==1)then s=0.5*(b-a)*(Func(a)+Func(b)) else tnm=2**(n-1) del=(b-a)/tnm x=A sum=0.0 do j=2,tnm x=x+del sum=sum+Func(x) end do s=0.5*(Func(A)+Func(B)+2.0*sum)*del end if end subroutine TRAPZD ½á¹ûΪ£º integral of Func with 2^(n-1) points actual value of integral is -0.479158 n Approx.integral 1 0.905773 2 -0.020945 3 -0.361461 4 -0.449584 5 -0.471756 6 -0.477308 7 -0.478696 8 -0.479043 9 -0.479130 10 -0.479152 11 -0.479157 12 -0.479158 13 -0.479159 14 -0.479159 15 -0.479159 |
3Â¥2009-04-10 20:24:50
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ľ³æ (ÖøÃûдÊÖ)
- Ó¦Öú: 26 (СѧÉú)
- ¹ó±ö: 0.17
- ½ð±Ò: 4774.1
- É¢½ð: 8
- ºì»¨: 42
- Ìû×Ó: 1361
- ÔÚÏß: 215.2Сʱ
- ³æºÅ: 659094
- ×¢²á: 2008-11-21
- רҵ: ½ðÊô½á¹¹²ÄÁÏ
4Â¥2009-04-10 20:25:07
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ľ³æ (ÖøÃûдÊÖ)
- Ó¦Öú: 26 (СѧÉú)
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- ½ð±Ò: 4774.1
- É¢½ð: 8
- ºì»¨: 42
- Ìû×Ó: 1361
- ÔÚÏß: 215.2Сʱ
- ³æºÅ: 659094
- ×¢²á: 2008-11-21
- רҵ: ½ðÊô½á¹¹²ÄÁÏ
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kuhailangyu(½ð±Ò+1,VIP+0):׷ןÐл£¡ 4-10 21:59
jianchaoyv(½ð±Ò+7,VIP+0):¸Ðл°ïæ,½»¸öÅóÓѰÉ,ÒÔºó¶à¶à̽ÌÖ! 4-11 09:03
kuhailangyu(½ð±Ò+1,VIP+0):׷ןÐл£¡ 4-10 21:59
jianchaoyv(½ð±Ò+7,VIP+0):¸Ðл°ïæ,½»¸öÅóÓѰÉ,ÒÔºó¶à¶à̽ÌÖ! 4-11 09:03
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?ʲôµØ·½Ã»½â¾ö£¿ Ä㻹¿ÉÒÔÔÚÖ÷³ÌÐòÖÐÕâÑùд£º real*8::a,b,pio2 ... a=0.d0 pio2=acos(a) b=pio2 ÕâÑù£¬Pi/2¾ÍÓкܸߵľ«¶È¡£ Èô°ÑÊä³ö¸Ä³ÉÊä³ö9λСÊý£¬ÎÒËãÁË£¬ÊÕÁ²µ½-0.479158789£¬ºÜ²»´íµÄ°¡¡£ÄãдµÄactual value of integral is -0.479158£¬·Ç³£½Ó½ü°¡¡£ ÓÐʲôÎÊÌâ˵³öÀ´£¬ÔÛÔÙÑо¿¡£²»¹ýÊýѧÉϵÄËã·¨ÎÒ²»¹Ü°¡¡£ºÇºÇ¡£ [ Last edited by ÀÏ»¢´óÍõ on 2009-4-10 at 21:51 ] |
5Â¥2009-04-10 21:50:00
jianchaoyv
½ð³æ (СÓÐÃûÆø)
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6Â¥2009-04-11 09:20:16
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ľ³æ (ÖøÃûдÊÖ)
- Ó¦Öú: 26 (СѧÉú)
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- ½ð±Ò: 4774.1
- É¢½ð: 8
- ºì»¨: 42
- Ìû×Ó: 1361
- ÔÚÏß: 215.2Сʱ
- ³æºÅ: 659094
- ×¢²á: 2008-11-21
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7Â¥2009-04-11 11:10:41
jianchaoyv
½ð³æ (СÓÐÃûÆø)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 964.9
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8Â¥2009-04-11 15:49:38
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ľ³æ (ÖøÃûдÊÖ)
- Ó¦Öú: 26 (СѧÉú)
- ¹ó±ö: 0.17
- ½ð±Ò: 4774.1
- É¢½ð: 8
- ºì»¨: 42
- Ìû×Ó: 1361
- ÔÚÏß: 215.2Сʱ
- ³æºÅ: 659094
- ×¢²á: 2008-11-21
- רҵ: ½ðÊô½á¹¹²ÄÁÏ
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ÄãÓÐûÓС¶computer simulation of liquids¡·Õâ±¾Ê飿±¾ÂÛ̳ºÃÏñ¿ÉÒÔÏÂÔØµÄ¡£¿ÉÒÔÔĶÁÊéºó¸½Â¼G3¡£ÊéÖÐÓÐÒ»¸öÉú³É³õʼËٶȵijÌÐò¡£ÎÒÁÐÔÚÏÂÃæ£¬Äã¿ÉÒԲο¼¡£ ÁíÍâÄã¿ÉÒԲο¼Ò»Ð©±à³ÌÊ飬ÈçÐìÊ¿Á¼µÄ¡¶fortran³£ÓÃËã·¨³ÌÐò¼¯¡·£¬ÀïÃæ½éÉÜÁËÈçºÎÉú³ÉÕý̬·Ö²¼µÄËæ»úÊý£¬Äã°´×Ô¼ºµÄÒªÇó¸ÄдһϾͿÉÒÔÁË¡£ ******************************************************************************** ** FICHE F.24. INITIAL VELOCITY DISTRIBUTION ** ** This FORTRAN code is intended to illustrate points made in the text. ** ** To our knowledge it works correctly. However it is the responsibility of ** ** the user to test it, if it is to be used in a research application. ** ******************************************************************************** C ******************************************************************* C ** CENTRE OF MASS AND ANGULAR VELOCITIES FOR LINEAR MOLECULES ** C ** ** C ** PRINCIPAL VARIABLES: ** C ** ** C ** INTEGER N THE NUMBER OF MOLECULES ** C ** REAL RX(N),RY(N),RZ(N) POSITIONS ** C ** REAL VX(N),VY(N),VZ(N) VELOCITIES ** C ** REAL EX(N),EY(N),EZ(N) ORIENTATIONS ** C ** REAL OX(N),OY(N),OZ(N) SPACE-FIXED ANGULAR VELOCITIES ** C ** REAL TEMP REDUCED TEMPERATURE ** C ** REAL INERT REDUCED MOMENT OF INERTIA ** C ** ** C ** SUPPLIED ROUTINES: ** C ** ** C ** SUBROUTINE COMVEL ( TEMP ) ** C ** SETS THE CENTRE OF MASS VELOCITIES FOR A CONFIGURATION OF ** C ** LINEAR MOLECULES AT A GIVEN TEMPERATURE. ** C ** SUBROUTINE ANGVEL ( TEMP, INERT ) ** C ** SETS THE ANGULAR VELOCITIES FOR A CONFIGURATION OF LINEAR ** C ** MOLECULES AT A GIVEN TEMPERATURE. ** C ** REAL FUNCTION RANF ( DUMMY ) ** C ** RETURNS A UNIFORM RANDOM VARIATE ON THE RANGE ZERO TO ONE ** C ** REAL FUNCTION GAUSS ( DUMMY ) ** C ** RETURNS A UNIFORM RANDOM NORMAL VARIATE FROM A ** C ** DISTRIBUTION WITH ZERO MEAN AND UNIT VARIANCE. ** C ** ** C ** UNITS: ** C ** ** C ** WE ASSUME UNIT MOLECULAR MASS AND EMPLOY LENNARD-JONES UNITS ** C ** PROPERTY UNITS ** C ** RX, RY, RZ (EPSILON/M)**(1.0/2.0) ** C ** OX, OY, OZ (EPSILON/M*SIGMA**2)**(1.0/2.0) ** C ** INERT M*SIGMA**2 ** C ******************************************************************* SUBROUTINE COMVEL ( TEMP ) COMMON / BLOCK1 / RX, RY, RZ, EX, EY, EZ, : VX, VY, VZ, OX, OY, OZ C ******************************************************************* C ** TRANSLATIONAL VELOCITIES FROM MAXWELL-BOLTZMANN DISTRIBUTION ** C ** ** C ** THE DISTRIBUTION IS DETERMINED BY TEMPERATURE AND (UNIT) MASS.** C ** THIS ROUTINE IS GENERAL, AND CAN BE USED FOR ATOMS, LINEAR ** C ** MOLECULES, AND NON-LINEAR MOLECULES. ** C ** ** C ** ROUTINE REFERENCED: ** C ** ** C ** REAL FUNCTION GAUSS ( DUMMY ) ** C ** RETURNS A UNIFORM RANDOM NORMAL VARIATE FROM A ** C ** DISTRIBUTION WITH ZERO MEAN AND UNIT VARIANCE. ** C ******************************************************************* INTEGER N PARAMETER ( N = 108 ) REAL RX(N), RY(N), RZ(N), EX(N), EY(N), EZ(N) REAL VX(N), VY(N), VZ(N), OX(N), OY(N), OZ(N) REAL TEMP REAL RTEMP, SUMX, SUMY, SUMZ REAL GAUSS, DUMMY INTEGER I C ******************************************************************* RTEMP = SQRT ( TEMP ) DO 100 I = 1, N VX(I) = RTEMP * GAUSS ( DUMMY ) VY(I) = RTEMP * GAUSS ( DUMMY ) VZ(I) = RTEMP * GAUSS ( DUMMY ) 100 CONTINUE C ** REMOVE NET MOMENTUM ** SUMX = 0.0 SUMY = 0.0 SUMZ = 0.0 DO 200 I = 1, N SUMX = SUMX + VX(I) SUMY = SUMY + VY(I) SUMZ = SUMZ + VZ(I) 200 CONTINUE SUMX = SUMX / REAL ( N ) SUMY = SUMY / REAL ( N ) SUMZ = SUMZ / REAL ( N ) DO 300 I = 1, N VX(I) = VX(I) - SUMX VY(I) = VY(I) - SUMY VZ(I) = VZ(I) - SUMZ 300 CONTINUE RETURN END SUBROUTINE ANGVEL ( TEMP, INERT ) COMMON / BLOCK1 / RX, RY, RZ, EX, EY, EZ, : VX, VY, VZ, OX, OY, OZ C ******************************************************************* C ** ANGULAR VELOCITIES FROM THE MAXWELL-BOLTZMANN DISTRIBUTION. ** C ** ** C ** THE DISTRIBUTION IS DETERMINED BY TEMPERATURE AND INERTIA. ** C ** THIS ROUTINE IS SPECIFIC TO LINEAR MOLECULES. ** C ** IT CHOOSES THE DIRECTION OF THE ANGULAR VELOCITY RANDOMLY BUT ** C ** PERPENDICULAR TO THE MOLECULAR AXIS. THE SQUARE OF THE ** C ** MAGNITUDE OF THE ANGULAR VELOCITY IS CHOSEN FROM AN ** C ** EXPONENTIAL DISTRIBUTION. THERE IS NO ATTEMPT TO SET THE ** C ** TOTAL ANGULAR MOMENTUM TO ZERO. ** C ** ** C ** ROUTINE REFERENCED: ** C ** ** C ** REAL FUNCTION RANF ( DUMMY ) ** C ** RETURNS A UNIFORM RANDOM VARIATE ON THE RANGE ZERO TO ONE ** C ******************************************************************* INTEGER N PARAMETER ( N = 108 ) REAL RX(N), RY(N), RZ(N), EX(N), EY(N), EZ(N) REAL VX(N), VY(N), VZ(N), OX(N), OY(N), OZ(N) REAL TEMP, INERT REAL NORM, DOT, OSQ, O, MEAN REAL XISQ, XI1, XI2, XI REAL RANF, DUMMY INTEGER I C **************************************************************** MEAN = 2.0 * TEMP / INERT C ** SET DIRECTION OF THE ANGULAR VELOCITY ** DO 100 I = 1, N C ** CHOOSE A RANDOM VECTOR IN SPACE ** XISQ = 1.0 1000 IF ( XISQ .GE. 1.0 ) THEN XI1 = RANF ( DUMMY ) * 2.0 - 1.0 XI2 = RANF ( DUMMY ) * 2.0 - 1.0 XISQ = XI1 * XI1 + XI2 * XI2 GO TO 1000 ENDIF XI = SQRT ( 1.0 - XISQ ) OX(I) = 2.0 * XI1 * XI OY(I) = 2.0 * XI2 * XI OZ(I) = 1.0 - 2.0 * XISQ C ** CONSTRAIN THE VECTOR TO BE PERPENDICULAR TO THE MOLECULE ** DOT = OX(I) * EX(I) + OY(I) * EY(I) + OZ(I) * EZ(I) OX(I) = OX(I) - DOT * EX(I) OY(I) = OY(I) - DOT * EY(I) OZ(I) = OZ(I) - DOT * EZ(I) C ** RENORMALIZE ** OSQ = OX(I) * OX(I) + OY(I) * OY(I) + OZ(I) * OZ(I) NORM = SQRT ( OSQ ) OX(I) = OX(I) / NORM OY(I) = OY(I) / NORM OZ(I) = OZ(I) / NORM C ** CHOOSE THE MAGNITUDE OF THE ANGULAR VELOCITY ** OSQ = - MEAN * LOG ( RANF ( DUMMY ) ) O = SQRT ( OSQ ) OX(I) = O * OX(I) OY(I) = O * OY(I) OZ(I) = O * OZ(I) 100 CONTINUE RETURN END REAL FUNCTION GAUSS ( DUMMY ) C ******************************************************************* C ** RANDOM VARIATE FROM THE STANDARD NORMAL DISTRIBUTION. ** C ** ** C ** THE DISTRIBUTION IS GAUSSIAN WITH ZERO MEAN AND UNIT VARIANCE.** C ** ** C ** REFERENCE: ** C ** ** C ** KNUTH D, THE ART OF COMPUTER PROGRAMMING, (2ND EDITION ** C ** ADDISON-WESLEY), 1978 ** C ** ** C ** ROUTINE REFERENCED: ** C ** ** C ** REAL FUNCTION RANF ( DUMMY ) ** C ** RETURNS A UNIFORM RANDOM VARIATE ON THE RANGE ZERO TO ONE ** C ******************************************************************* REAL A1, A3, A5, A7, A9 PARAMETER ( A1 = 3.949846138, A3 = 0.252408784 ) PARAMETER ( A5 = 0.076542912, A7 = 0.008355968 ) PARAMETER ( A9 = 0.029899776 ) REAL SUM, R, R2 REAL RANF, DUMMY INTEGER I C ******************************************************************* SUM = 0.0 DO 10 I = 1, 12 SUM = SUM + RANF ( DUMMY ) 10 CONTINUE R = ( SUM - 6.0 ) / 4.0 R2 = R * R GAUSS = (((( A9 * R2 + A7 ) * R2 + A5 ) * R2 + A3 ) * R2 +A1 ) : * R RETURN END REAL FUNCTION RANF ( DUMMY ) C ******************************************************************* C ** RETURNS A UNIFORM RANDOM VARIATE IN THE RANGE 0 TO 1. ** C ** ** C ** *************** ** C ** ** WARNING ** ** C ** *************** ** C ** ** C ** GOOD RANDOM NUMBER GENERATORS ARE MACHINE SPECIFIC. ** C ** PLEASE USE THE ONE RECOMMENDED FOR YOUR MACHINE. ** C ******************************************************************* INTEGER L, C, M PARAMETER ( L = 1029, C = 221591, M = 1048576 ) INTEGER SEED REAL DUMMY SAVE SEED DATA SEED / 0 / C ******************************************************************* SEED = MOD ( SEED * L + C, M ) RANF = REAL ( SEED ) / M RETURN END |
9Â¥2009-04-11 17:43:24
jianchaoyv
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10Â¥2009-04-11 18:39:54














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