How to extrapolate the fit line and uncertainty bands?

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Bum 2013-3-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/68155-how-to-extrapolate-the-fit-line-and-uncertainty-bands

I used the function 'fit' and 'predint' to plot the data, fit line and 95% bound from the year 1965 to 1990 as below. How can I extrapolate these lines to the year 2100?

x=[1:27]';
for i=1:12
    subplot(3,4,i);
      y_var=RCM_Var_time{i,1}(:,1);
      fitresult=fit(x,y_var,'poly1');
      a=coeffvalues(fitresult);
      p11=predint(fitresult,x,0.95,'functional','on');
      if (a(1,1)>0)
          plot(fitresult,'b',x,y_var,'.k');
      else
          plot(fitresult,'r',x,y_var,'.k');
      end
      hold on;
      plot(x,p11,'m-.');
      hold on;
      set(gca,'XTick',1:5:30);
      set(gca,'XTickLabel',{1965:5:1995});
      set(gca,'YTick',0:0.5:3.5);
      set(gca, 'YLim', [0 3.5])
      title([Month{1,i}]);
      xlabel([]);
      ylabel('Q4 Variance');
      legend off;
  end