Interfacing function
eng

##
SWITCH2

### File content

    function [x,y,typ]=SWITCH2(job,arg1,arg2)
      x=[];y=[];typ=[]
      select job
       case 'plot' then
        standard_draw(arg1)
       case 'getinputs' then
        [x,y,typ]=standard_inputs(arg1)
       case 'getoutputs' then
        [x,y,typ]=standard_outputs(arg1)
       case 'getorigin' then
        [x,y]=standard_origin(arg1)
       case 'set' then
        x=arg1;
        graphics=arg1.graphics;exprs=graphics.exprs
        model=arg1.model;
        while %t do
          [ok,rule,thra,nzz,exprs]=getvalue('Set parameters',..
    		['pass first input if: u2>=a (0), u2>a (1), u2~=a (2)';..
    		    'threshold a';'use zero crossing: yes (1), no (0)'],..
    		    list('vec',1,'vec',1,'vec',1),exprs)
          if ~ok then break,end
          rule=int(rule);
          if (rule<0) then rule=0, end
          if (rule>2) then rule=2, end
          graphics.exprs=exprs;
          model.ipar=rule
          model.rpar=thra
          if nzz<>0 then
    	model.nmode=1
    	model.nzcross=1
          else
    	model.nmode=0
    	model.nzcross=0
          end
          x.graphics=graphics;x.model=model
          break
        end
       case 'define' then
        in=[-1;1;-1]
        ipar=[0] // rule
        nzz=1
        rpar=0

        model=scicos_model()
        model.sim=list('switch2',4)
        model.in=in
        model.out=-1
        model.ipar=ipar
        model.rpar=rpar
        model.nzcross=nzz
        model.nmode=1
        model.blocktype='c'
        model.dep_ut=[%t %f]

        exprs=[string(ipar);string(rpar);string(nzz)]

        gr_i=['xstringb(orig(1),orig(2),[''switch''],sz(1),sz(2),''fill'');']
        x=standard_define([2 2],model,exprs,gr_i)
      end
    endfunction