source:
LMDZ.3.3/trunk/libf/phylmd/ran0_vec.F
@
5415
| Last change on this file since 5415 was 465, checked in by , 21 years ago | |
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| File size: 712 bytes | |
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| [465] | 1 | subroutine ran0_vec(npoints,idum,ran0) |
| 2 | ||
| 3 | ! $Id: ran0_vec.F 465 2003-08-06 14:45:44Z fairhead $ | |
| 4 | ! Platform independent random number generator from | |
| 5 | ! Numerical Recipies | |
| 6 | ! Mark Webb July 1999 | |
| 7 | ||
| 8 | implicit none | |
| 9 | ||
| 10 | integer j,npoints,idum(npoints),IA,IM,IQ,IR,k(npoints) | |
| 11 | real ran0(npoints),AM | |
| 12 | ||
| 13 | parameter (IA=16807, IM=2147483647, AM=1.0/IM, IQ=127773, IR=2836) | |
| 14 | ||
| 15 | c do j=1,npoints | |
| 16 | c if (idum(j).eq.0) then | |
| 17 | c write(6,*) 'idum=',idum | |
| 18 | c write(6,*) 'ZERO seed not allowed' | |
| 19 | c stop | |
| 20 | c endif | |
| 21 | c enddo | |
| 22 | ||
| 23 | do j=1,npoints | |
| 24 | k(j)=idum(j)/IQ | |
| 25 | idum(j)=IA*(idum(j)-k(j)*IQ)-IR*k(j) | |
| 26 | if (idum(j).lt.0) idum(j)=idum(j)+IM | |
| 27 | ran0(j)=AM*idum(j) | |
| 28 | enddo | |
| 29 | ||
| 30 | end | |
| 31 |
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