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subroutine drdiv(a,ia,b,ib,r,ir,n,ierr)
c! purpose
c computes r=a./b with a and b real
c
c ia,ib,ir : increment between two consecutive element of vectors a
c b and r
c n : vectors length
c ierr : returned error flag:
c o : ok
c <>0 : b(ierr)=0
c!
c Copyright INRIA
double precision a(*),b(*),r(*)
integer ia,ib,ir,n
jr=1
jb=1
ja=1
k=0
ierr=0
if (ia.eq.0) then
do 10 k=1,n
if(b(jb).eq.0.0d0) then
ierr=k
return
endif
r(jr)=a(ja)/b(jb)
jr=jr+ir
jb=jb+ib
10 continue
elseif(ib.eq.0) then
if(b(jb).eq.0.0d0) then
ierr=1
return
endif
do 11 k=1,n
r(jr)=a(ja)/b(jb)
jr=jr+ir
ja=ja+ia
11 continue
else
do 12 k=1,n
if(b(jb).eq.0.0d0) then
ierr=k
return
endif
r(jr)=a(ja)/b(jb)
jr=jr+ir
jb=jb+ib
ja=ja+ia
12 continue
endif
end
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