subroutine tanblk(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
double precision t,xd(*),x(*),z(*),tvec(*),rpar(*),u(*),y(*)
integer flag,nevprt,nx,nz,ntvec,nrpar,ipar(*)
integer nipar,nu,ny
c
double precision ww
c
do 15 i=1,nu
ww=cos(u(i))
if(ww.ne.0.0d0) then
y(i)=sin(u(i))/ww
else
flag=-2
return
endif
15 continue
end