Plotting error bars in different scale?

Question

Auryn_ 2018-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/403207-plotting-error-bars-in-different-scale

评论： Ameer Hamza 2018-5-30

采纳的回答： Ameer Hamza

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Hi,

I plotted the following:

 x = 1:5;
 y = 100*[0.2466 0.2195 0.1976 0.1796 0.1663]; 
 err = 100*[0.0523 0.0494 0.0469 0.0447 0.0430];
 errorbar(x,y,err)

which results in this:

My question is: why are the errorbars so big? If I look at the values at the y axis, the first error bar with a value of 5.23 goes from (approximately) y=19.5 to y=29.9, which is 10.5, not 5.23!

Can you help me to understand this?

Thanks!

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Answer 1

Ameer Hamza 2018-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/403207-plotting-error-bars-in-different-scale#answer_322505

在 MATLAB Online 中打开

Because the err in errorbar() defines the length of error bar from mean position. Therefore the error bar varies from 24.66-5.23=19.46 to 24.66+5.2=29.86. This is exactly what you observed. To correct, divide the err by 2

err = 100*[0.0523 0.0494 0.0469 0.0447 0.0430]/2;