curve fitting with error bar

Hi,

I want to fit the curve with the error bar but it didn't display the error bar. Can you please help me how can I fit the data (curve) with error bar? I tried the following codes..

curvefit = fit(x2,y2,'poly3','normalize','on');
figure (13);
errorbar(x2,y2,err2,'go');hold on;% plots the graph with errorbar
plot(curvefit,x2,y2);hold off

Answer 1

[Srivardhan Gadila]

Based on the above information I think while calling the errorbar function you have to first compute the value of y coordinates from the fitted curve and then call the errorbar funtion on these new values in order to get the errorbar on the curve.

load franke
cfit = fit(x,y,'poly3','normalize','on');
figure
plot(cfit,x,y)
hold on
yfit = cfit(x);
err = abs(y-yfit);
errorbar(x,yfit,err,'go')

If this is not what you are looking for, can you provide more information by attaching images of what should be the output plot and any other required information.