# Showing Standard deviation (errorbar) in Radar Plot / on rotated axes

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Freya H 2018 年 8 月 14 日
コメント済み: dpb 2018 年 8 月 16 日
In my radarplot I calculate the mean of certain values which I show on each one of the axes. I would now like to add an errorbar.
My issue is that I cannot rotate the errorbar in the same way the 'normal' points are rotated (using pol2cart). You can see that result in the picture kiviat1.
My idea to work around this was to just add every errorbar as their own plot. You can see that result in kiviat2. As you can see, the errorbar is rotated, but I cannot find a way to have a nice marker that will actually make it look like a regular standard deviation.
I would be glad to get some new solution ideas. I have also attached an example testscript and the radar plot function (lines 227 and following are the ones where the points are plotted).
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dpb 2018 年 8 月 16 日
It should be possible to do the required geometry transformation based on that number/angle and wrap in a function so that you only then have to deal with the details once.

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### 採用された回答

Freya H 2018 年 8 月 16 日
@dpb: thanks again for the final idea & you are right, it wasn't all to difficult to set up all bars at once.
Not the nicest solution and something is slightly off in the transformation (angles are not exactly 90 degrees), but I didn't care enough to fix it as it's barely noticeable.
This function now creates the kiviat diagram including errorbars:
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dpb 2018 年 8 月 16 日
Bravo! Looks good to me...I'd never notice any off-normal projection if weren't mentioned and I'm not sure I can really tell even when told...

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