source:
LMDZ4/branches/LMDZ4_V3_patches/libf/phylmd/ran0_vec.F
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1 | ! |
2 | ! $Header$ |
3 | ! |
4 | subroutine ran0_vec(npoints,idum,ran0) |
5 | |
6 | ! $Id: ran0_vec.F 844 2007-09-14 14:01:10Z jghattas $ |
7 | ! Platform independent random number generator from |
8 | ! Numerical Recipies |
9 | ! Mark Webb July 1999 |
10 | |
11 | implicit none |
12 | |
13 | integer j,npoints,idum(npoints),IA,IM,IQ,IR,k(npoints) |
14 | real ran0(npoints),AM |
15 | |
16 | parameter (IA=16807, IM=2147483647, AM=1.0/IM, IQ=127773, IR=2836) |
17 | |
18 | c do j=1,npoints |
19 | c if (idum(j).eq.0) then |
20 | c write(6,*) 'idum=',idum |
21 | c write(6,*) 'ZERO seed not allowed' |
22 | c stop |
23 | c endif |
24 | c enddo |
25 | |
26 | do j=1,npoints |
27 | k(j)=idum(j)/IQ |
28 | idum(j)=IA*(idum(j)-k(j)*IQ)-IR*k(j) |
29 | if (idum(j).lt.0) idum(j)=idum(j)+IM |
30 | ran0(j)=AM*idum(j) |
31 | enddo |
32 | |
33 | end |
34 |
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