# How to draw a plot bars around a mean in Julia?

**URL:** <https://discourse.julialang.org/t/how-to-draw-a-plot-bars-around-a-mean-in-julia/9524>\
**Category:** New to Julia\
**Created:** [March 5, 2018, 10:49pm UTC](https://discourse.julialang.org/t/how-to-draw-a-plot-bars-around-a-mean-in-julia/9524 "2018-03-05T22:49:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![etairi](https://avatars.discourse-cdn.com/v4/letter/e/c89c15/32.png) [@etairi](https://discourse.julialang.org/u/etairi)\
**Post date:** [March 5, 2018, 10:49pm UTC](https://discourse.julialang.org/t/how-to-draw-a-plot-bars-around-a-mean-in-julia/9524/1 "2018-03-05T22:49:15Z")

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I basically have some data in a CSV file, which includes two columns, first one is values from 1 to 50, and the second one contains 50 values whose mean is 0, and the values are + or - some small difference from 0. So basically, I want to plot something like this:

![](https://global.discourse-cdn.com/julialang/original/3X/2/3/23b5474b9650bdb3032a4f0d9c7a76a79fa2a233.png)

I have something like this:

```julia
using DataFrames
using Cairo, Gadfly

data = CSV.read("simulate.csv")
p = plot(data, x=:num, y=:value, Geom.point);

```

But the above generates a point plot. Does, Gadfly let you plot something like in the picture? Of course in my case the mean will be 0.

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**Author:** ![Mattriks](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mattriks/32/351_2.png) [@Mattriks](https://discourse.julialang.org/u/Mattriks)\
**Post date:** [March 5, 2018, 11:07pm UTC](https://discourse.julialang.org/t/how-to-draw-a-plot-bars-around-a-mean-in-julia/9524/2 "2018-03-05T23:07:39Z")

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- List of `Geometries` currently available in `Gadfly`: [http://gadflyjl.org/stable/lib/geometries.html](http://gadflyjl.org/stable/lib/geometries.html)
- [`Geom.bar`](http://gadflyjl.org/stable/lib/geoms/geom_bar.html)

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<div class="post-metadata">

**Author:** ![xiaodai](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/xiaodai/32/15937_2.png) [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Post date:** [March 6, 2018, 2:56am UTC](https://discourse.julialang.org/t/how-to-draw-a-plot-bars-around-a-mean-in-julia/9524/3 "2018-03-06T02:56:48Z")

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```julia
using Plots
bar(1:50,ur50vals)

```