# How to scale the density of violin plot

**URL:** https://discourse.julialang.org/t/how-to-scale-the-density-of-violin-plot/104737
**Category:** General Usage
**Tags:** question, plotting, statsplots
**Created:** [October 8, 2023, 9:12pm UTC](https://discourse.julialang.org/t/how-to-scale-the-density-of-violin-plot/104737 "2023-10-08T21:12:04Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Christopher\_Fisher](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/christopher_fisher/32/26132_2.png) [@Christopher\_Fisher](https://discourse.julialang.org/u/Christopher_Fisher)
#### Post date: [October 8, 2023, 9:12pm UTC](https://discourse.julialang.org/t/how-to-scale-the-density-of-violin-plot/104737/1 "2023-10-08T21:12:04Z")

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I would like to use a violin plot to display density information. For the x-axis, the scaling matters. However, only the shape of the densities matter. How can I rescale the densities to prevent occlusion?

Here is a simple example:

```julia
using StatsPlots
violin(repeat([.1,.2,.3],outer=100),randn(300), side=:right)

```

Thanks!

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<div class="post-metadata">

### Author: ![jd-foster](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jd-foster/32/35824_2.png) [@jd-foster](https://discourse.julialang.org/u/jd-foster)
#### Post date: [October 9, 2023, 2:36am UTC](https://discourse.julialang.org/t/how-to-scale-the-density-of-violin-plot/104737/2 "2023-10-09T02:36:17Z")

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It seems to help to use `groupedviolin` instead

```julia
groupedviolin(repeat([.1,.2,.3],outer=100),randn(300), side=:right, fillalpha=0.25)

```

![image](https://global.discourse-cdn.com/julialang/original/3X/7/a/7aa3392c021ede06dd35f477be710a7caaa5fd20.png)

Code here: [https://github.com/JuliaPlots/StatsPlots.jl/blob/d63908437088d74bc7daa32f4915e51f3c25fa11/src/violin.jl#L180](https://github.com/JuliaPlots/StatsPlots.jl/blob/d63908437088d74bc7daa32f4915e51f3c25fa11/src/violin.jl#L180)

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<div class="post-metadata">

### Author: ![Christopher\_Fisher](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/christopher_fisher/32/26132_2.png) [@Christopher\_Fisher](https://discourse.julialang.org/u/Christopher_Fisher)
#### Post date: [October 9, 2023, 11:06am UTC](https://discourse.julialang.org/t/how-to-scale-the-density-of-violin-plot/104737/3 "2023-10-09T11:06:58Z")

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Thank you. That does help quite a bit in many cases. It does break down when the spacing is variable:

`groupedviolin(repeat([.1,.15,.5],outer=100),randn(3000)*.1, side=:right, fillalpha=0.25)`

![example](https://global.discourse-cdn.com/julialang/original/3X/c/9/c9284686b3208c83ef3e6b9d61061395a2375de1.png)

I noticed the keyword `spacing` in the linked function, but it did not seem to have an effect on the space.

Somewhat related question: is it possible to use fillalpha between quantiles, such as at .025 and .975?