opas.f File Reference

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Functions/Subroutines
subroutine	opas (n, x, y, ad, au, jq, irow, nzs)

Function/Subroutine Documentation

opas()

subroutine opas	(	integer	n,
		real*8, dimension(*)	x,
		real*8, dimension(*)	y,
		real*8, dimension(*)	ad,
		real*8, dimension(*)	au,
		integer, dimension(*)	jq,
		integer, dimension(*)	irow,
		integer, dimension(3)	nzs
	)

!
      implicit none
!
      integer irow(*),n,nzs(3),j,l,i,jq(*)
      real*8 y(*),x(*),au(*),ad(*)
!
!     diagonal terms
!
      do i=1,n
         y(i)=ad(i)*x(i)
      enddo
!
!     off-diagonal terms
!
      do j=1,n
         do l=jq(j),jq(j+1)-1
            i=irow(l)
            y(i)=y(i)+au(l)*x(j)
            y(j)=y(j)+au(l+nzs(3))*x(i)
         enddo
      enddo
!
      return