time   calls  line
                 82 function fig = ObserveFigureNextPlot(fig, hsave)
                 83 %
                 84 % Helper fcn for preparing figure for nextplot, optionally
                 85 % preserving specific existing descendants.
                 86 % GUARANTEED to return a figure, even if some crazy combination
                 87 % of create / delete fcns deletes it.
                 88 %
  0.01     677   89 switch get(fig,'nextplot') 
           677   90   case 'new' 
                 91     % if someone calls plot(x,y,'parent',h) and h is an axes
                 92     % in a figure with NextPlot 'new', ignore the 'new' and
                 93     % treat it as 'add' - just add the axes to that figure.
                 94     if isempty(hsave)
                 95       fig = figure;
                 96     end
           677   97   case 'replace' 
                 98     clf(fig, 'reset', hsave);
  0.01     677   99   case 'replacechildren' 
                100     clf(fig, hsave);
           677  101   case 'add' 
                102     % nothing    
           677  103 end 
           677  104 if ~any(ishghandle(fig)) && isempty(hsave) 
                105   fig = figure;
                106 end

Other subfunctions in this file are not included in this listing.