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real function ranw(idum) Parameter (Mbig=2**30-2, Xinvers=1./Mbig) data ibit/ 1/ Integer IX(55) save if (ibit.ne.0) then ibit=0 cc cc fill up the vector ix with some random integers, which are cc not all even cc if (idum.eq.0) pause 'use nonzero value of idum' idum=abs(mod(idum,Mbig)) ibit=0 Ix(1)=871871 Do i=2,55 Ix(i)=mod(Ix(i-1)+idum,Ix(i-1)) Ix(i)=max(mod(Ix(i),Mbig),idum) end do j=24 k=55 cc cc warm up the generator cc do i=1,1258 Ix(k)=mod(Ix(k)+Ix(j),Mbig) j=j-1 if (j.eq.0) j=55 k=k-1 if (k.eq.0) k=55 end do end if cc cc this is where execution usually starts: cc Ix(k)=mod(Ix(k)+Ix(j),Mbig) j=j-1 if (j.eq.0) j=55 k=k-1 if (k.eq.0) k=55 ranw=Ix(k)*Xinvers end |
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