Computational routine
eng

##
gensqr

### File content

          subroutine gensqr(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     Square wave generator
    c     period=2*rpar(1)
    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 atol,rtol,ttol,deltat
          common /costol/ atol,rtol,ttol,deltat
    c
          if(flag.eq.2) then
             z(1)=-z(1)
          elseif(flag.eq.1.or.flag.eq.6) then
             y(1)=z(1)
          endif
          end