Stacked bar chart with continuous Y variables

**Cadco** · February 6, 2019, 4:18am

*Updated with an example
Hello,
I am trying to make a stacked bar chart where the x-axis is categorical, by the y-axis is continuous. As it is, my code produces a bar chart where instead of a stacked chart, the bars are colored to designate the value for the second y-value. I want to produce a typical stacked chart where the color changes where the first y-variable ends. Here is my current code:

library(ggplot2)
Bar <- ggplot(iris,aes(Species,Sepal.Width,fill=Sepal.Length))+
  geom_col()
Bar

^{Created on 2019-02-05 by the reprex package (v0.2.1)}
Thanks!

**andresrcs** · February 6, 2019, 2:32am

We don't really have enough info to help you out. Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

FAQ: How to do a minimal reproducible example ( reprex ) for beginners Guides & FAQs

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the error The minimal runnable code necessary to reproduce the error, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of this Minimal Dataset (Sample Data) You need to provide a dataframe that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say that you are working with the iris dataframe head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.2 setosa #> 2 4.9 …

**Cadco** · February 6, 2019, 3:53am

I think I accomplished that. Thanks!

**apreshill** · February 6, 2019, 3:59am

A stacked bar chart is intended usually with color variables that are factor variables rather than continuous. Your code is mapping the fill aesthetic to a continuous variable, Sepal.Length, which is why ggplot2 is using colors in this way. If you want a continuous y-axis and want a stacked bar chart, the variable you map onto the fill aesthetic needs to be a factor variable. You can see some example plots/code here:

**andresrcs** · February 6, 2019, 4:02am

You were very close on your reprex, the idea was to use a small sample of your own data, but if you want to use the iris data set, there is no need for the df_paste() call, since iris comes with R by default.

**nwerth** · February 6, 2019, 3:13pm

I don't understand what you're going for. Could you share a drawing of your goal?

**Matthias** · February 13, 2019, 9:13am

Nice, art by accident!

**jdlong** · February 13, 2019, 10:17am

How do you expect this to work? I honestly don't even know what it means to "stack a continuous variable"

**system** · March 6, 2019, 10:32am

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