Interfacing function
eng

##
DERIV

### File content

    function [x,y,typ]=DERIV(job,arg1,arg2)
    // Copyright INRIA
    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
    case 'define' then
      model=scicos_model()
      model.sim=list('deriv',4)
      model.in=-1
      model.out=-1
      model.blocktype='x'
      model.dep_ut=[%t %f]

      exprs=[]
      gr_i=['xstringb(orig(1),orig(2),''  du/dt  '',sz(1),sz(2),''fill'');']
      x=standard_define([2 2],model,exprs,gr_i)
      x.graphics.id='s'
    end
    endfunction