I try to create a stacked histogram. Like this:
![enter image description here](https://i.stack.imgur.com/tfteU.png)

My data consists of classes (0-4) and a float value for each class.

I already have a histogram for all mean values. But I would like to color the bars according to the amount of classes in each bar. 

What I have:

![enter image description here](https://i.stack.imgur.com/JsDSW.png)

Code:

```
\documentclass{article}
\usepackage{filecontents}
\usepackage{pgfplots, pgfplotstable}
% first number is a class (0-4), second float number is the mean of the data
\begin{filecontents*}{data.csv}
                1,0.177597344546
                1,0.18105947348
                1,0.177429493018
                2,0.244377481246
                4,0.185496836789
                0,0.180714004683
                4,0.187928321127
                3,0.188037364067
                4,0.187302774169
                3,0.188172520266
\end{filecontents*}
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
            ybar stacked,
            ymin=0,
        ]
        \addplot +[
            hist={
                bins=20,
            }   
        ] table [x, y, col sep=comma] {data.csv};
    \end{axis}
\end{tikzpicture}
\end{document}

```