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fortranµÄ0,1Ö®¼ä¾ùÔÈ·Ö²¼Ëæ»úÊý³ÌÐò ran2(idum),ΪʲôÎÒran2(6)ºÍran2(10)µÄ½á¹û¶¼ÊÇÒ»ÑùµÄ£¬¶¼ÊÇ0.6554£¬ Õâ¸öran2ÔÚmatlabÏÂÀàËÆµÄº¯ÊýÊÇÊ²Ã´ÄØ£¿MatlabÀïÓÐrand, »¹ÊÇrand(idum£¬1) ,ÕâÀïÓиö±È½ÏÓÐÒâ˼µÄÊÇrandÊÇÖ±½Ó³öÀ´Ò»¸öËæ»úÊý£¬¶ørand(idum,1)ÊdzöÏÖÒ»ÁÐidum¸öËæ»ú±äÁ¿£» fortranÀïÃæµÄran2(idum)ÔËÐнá¹û¾ÍÊÇÒ»¸öÊý£¬¶øÊÇ£¬idum=6£¬ºÍ10´ð°¸¶¼ÊÇ0.6554£¿¶ÔfortranµÄran2Ó÷¨»¹²»ÐУ¬ Çë´ó¼ÒÖ¸µã£¬Ð»Ð»¡£ FUNCTION ran2(idum) INTEGER, INTENT(OUT) :: idum REAL :: ran2 INTEGER, PARAMETER :: im1=2147483563 INTEGER, PARAMETER :: im2=2147483399 REAL, PARAMETER :: am=1./im1 INTEGER, PARAMETER :: imm1=im1-1 INTEGER, PARAMETER :: ia1=40014 INTEGER, PARAMETER :: ia2=40692 INTEGER, PARAMETER :: iq1=53668 INTEGER, PARAMETER :: iq2=52774 INTEGER, PARAMETER :: ir1=12211 INTEGER, PARAMETER :: ir2=3791 INTEGER, PARAMETER :: ntab=32 INTEGER, PARAMETER :: ndiv=1+imm1/ntab REAL, PARAMETER :: eps=1.2E-7 REAL, PARAMETER :: rnmx=1.-eps INTEGER :: idum2,j,k,iv(ntab),iy SAVE iv,iy,idum2 DATA idum2/123456789/, iv/ntab*0/, iy/0/ IF (idum <= 0) THEN idum=MAX(-idum,1) idum2=idum DO j=ntab+8,1,-1 k=idum/iq1 idum=ia1*(idum-k*iq1)-k*ir1 IF (idum < 0) idum=idum+im1 IF (j <= ntab) iv(j)=idum END DO iy=iv(1) END IF k=idum/iq1 idum=ia1*(idum-k*iq1)-k*ir1 IF (idum < 0) idum=idum+im1 k=idum2/iq2 idum2=ia2*(idum2-k*iq2)-k*ir2 IF (idum2 < 0) idum2=idum2+im2 j=1+iy/ndiv iy=iv(j)-idum2 iv(j)=idum IF(iy < 1)iy=iy+imm1 ran2=MIN(am*iy,rnmx) RETURN END FUNCTION ran2 |
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