> For the complete documentation index, see [llms.txt](https://a-styd.gitbook.io/apexcharts-ruby/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://a-styd.gitbook.io/apexcharts-ruby/usage/heatmap-chart.md).

# Heatmap Chart

```erb
<% heatmap_series = 17.downto(10).map do |n|
  {
    name: "#{n}:00",
    data: 15.times.map do |i|
      ["W#{i+1}", rand(90)]
    end.to_h
  }
end %>
<%= heatmap_chart(heatmap_series) %>
```

![Example Heatmap Chart](/files/MXGzKgDMUgXZlW8rIp0B)