subroutine delay(flag,nevprt,t,xd,x,nx,z,nz,tvec,ntvec,
& rpar,nrpar,ipar,nipar,u,nu,y,ny)
c Copyright INRIA
c Scicos block simulator
c Ouputs nx*dt delayed input
c
double precision t,xd(*),x(*),z(*),tvec(*),rpar(*),u(*),y(*)
integer flag,nevprt,nx,nz,ntvec,nrpar,ipar(*)
integer nipar,nu,ny
c
if(flag.eq.1.or.flag.eq.4.or.flag.eq.6) then
y(1)=z(1)
elseif(flag.eq.2) then
c . shift buffer
do 10 i=1,nz-1
z(i)=z(i+1)
10 continue
c . add new point to the buffer
z(nz)=u(1)
endif
end