randomval.f File Reference

Go to the source code of this file.

Functions/Subroutines
subroutine	randomval (randval, nev)

Function/Subroutine Documentation

randomval()

subroutine randomval	(	real*8, dimension(*)	randval,
		integer	nev
	)

!
!     Creation of normal ditributed unit variance gaussian       
!     random variables using the Box-Muller-Transformation
!
      implicit none
!
      integer nev,i
!
      real*8 randval(*),fac,v1,v2,rsq
!      
      call random_seed()
!
      do i=1,nev
         do
            call random_number(v1)
            call random_number(v2)
            rsq=v1**2+v2**2
            if((rsq.ge.1.d0).or.(rsq.le.0.d0)) cycle
            fac=sqrt(-2.*dlog(rsq)/rsq)  
            randval(i)=v1*fac
            exit
         enddo
      enddo
!
      return