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# How to insert error bars in interpolation plot?

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Sara Filippini on 16 Nov 2020
Answered: Deepak Meena on 20 Nov 2020
My plot is a linear interpolation of N scatter points. I'm trying to mark those points as bar errors, and tune the length of the bar errors according to the y axis.
For example: I have a linear interpolation of the gain of an amplifier, I know that the average noise is 100 mV, I want to have a 100 mV bar for each scatter point.
Thank you everyone!
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Rik on 16 Nov 2020
What have you tried?
Have a read here and here. It will greatly improve your chances of getting an answer.

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### Answers (1)

Deepak Meena on 20 Nov 2020
Hi Sara,
you can refer to the following documentation to plot error bars in interpolated plots:
Following example illustrate how you can use the above functions :
x = 0:pi/4:2*pi;
v = sin(x);
xq = 0:pi/16:2*pi;
err = 0.5*ones(size(v));
figure
vq1 = interp1(x,v,xq);
plot(x,v,'o',xq,vq1,':.');%%interpolated data
hold on
errorbar(x,v,err);%putting error bars on the original points
so the interpolated data looks like this: and the plot with the error bars looks like this Hope this helps
Thanks
Deepak
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