How to extrapolate the fit line and uncertainty bands?
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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
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