# How to adjust the tick size of errorbar in a plot?

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Namira on 1 Oct 2018
Edited: Adam Danz on 4 Oct 2018

I have a linear fit figure where I want to control the tick size of the error bar. I want to reduce the length of the error bar. I searched in online but I didn't find any solution on how to do this. Any suggestions from anyone? Thanks in advance.

Adam Danz on 1 Oct 2018
I continued my feedback as an answer below.

Adam Danz on 1 Oct 2018
Edited: Adam Danz on 1 Oct 2018
err = 8*ones(size(y)); errorbar(x,y,err)
So the error bars don't represent error in your data; they just represent the a value of +/- 8 in log space. Log(8) = 2.08 and you'll notice that your error bars stretch from +/- 2.08 along the y axis from the data points. This is what errorbar() does when you enter a vector of error values (see below).
>> help errorbar
errorbar Plot error bars along curve
errorbar(Y,E) plots Y and draws a vertical error bar at each element of
Y. The error bar is a distance of E(i) above and below the curve so
that each bar is symmetric and 2*E(i) long.
To shrink your error bars, you just need to decrease your "error" value from 8 to something smaller. Just realize that your error bars do not represent error or anything meaningful at all if you're just deceitfully choosing a value to make the bars smaller and anyone viewing the data should be aware of that.
Adam Danz on 4 Oct 2018
Error bars represent the error or uncertainty in your data. They should be calculated from your data. Examples of common error measurements used in error bars are
• standard deviation
• standard error
• interquartile range
• confidence intervals
The length of the error bar indicates the amount of error but the scale along the y-axis can also affect the length of the vertical error bars.

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