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| 1 | ! |
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| 2 | ! $Header$ |
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| 3 | ! |
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| 4 | subroutine ran0_vec(npoints,idum,ran0) |
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| 5 | |
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| 6 | ! $Id: ran0_vec.F 524 2004-05-19 12:53:04Z lmdzadmin $ |
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| 7 | ! Platform independent random number generator from |
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| 8 | ! Numerical Recipies |
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| 9 | ! Mark Webb July 1999 |
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| 10 | |
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| 11 | implicit none |
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| 12 | |
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| 13 | integer j,npoints,idum(npoints),IA,IM,IQ,IR,k(npoints) |
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| 14 | real ran0(npoints),AM |
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| 15 | |
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| 16 | parameter (IA=16807, IM=2147483647, AM=1.0/IM, IQ=127773, IR=2836) |
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| 17 | |
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| 18 | c do j=1,npoints |
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| 19 | c if (idum(j).eq.0) then |
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| 20 | c write(6,*) 'idum=',idum |
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| 21 | c write(6,*) 'ZERO seed not allowed' |
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| 22 | c stop |
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| 23 | c endif |
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| 24 | c enddo |
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| 25 | |
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| 26 | do j=1,npoints |
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| 27 | k(j)=idum(j)/IQ |
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| 28 | idum(j)=IA*(idum(j)-k(j)*IQ)-IR*k(j) |
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| 29 | if (idum(j).lt.0) idum(j)=idum(j)+IM |
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| 30 | ran0(j)=AM*idum(j) |
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| 31 | enddo |
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| 32 | |
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| 33 | end |
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| 34 | |
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