d3heatmap: Interactive heat maps

June 24, 2015
By

(This article was first published on RStudio Blog, and kindly contributed to R-bloggers)

We’re pleased to announce d3heatmap, our new package for generating interactive heat maps using d3.js and htmlwidgets. Tal Galili, author of dendextend, collaborated with us on this package.

d3heatmap is designed to have a familiar feature set and API for anyone who has used heatmap or heatmap.2 to create static heatmaps. You can specify dendrogram, clustering, and scaling options in the same way.

d3heatmap includes the following features:

  • Shows the row/column/value under the mouse cursor
  • Click row/column labels to highlight
  • Drag a rectangle over the image to zoom in
  • Works from the R console, in RStudio, with R Markdown, and with Shiny

Installation

install.packages("d3heatmap")

Examples

Here’s a very simple example (source: flowingdata):

url <-"http://datasets.flowingdata.com/ppg2008.csv"
nba_players

d3heatmap

You can easily customize the colors using the colors parameter. This can take an RColorBrewer palette name, a vector of colors, or a function that takes (potentially scaled) data points as input and returns colors.

Let’s modify the previous example by using the "Blues" colorbrewer palette, and dropping the clustering and dendrograms:

d3heatmap(nba_players, scale = "column", dendrogram = "none",
    color = "Blues")

d3heatmap

If you want to use discrete colors instead of continuous, you can use the col_* functions from the scales package.

d3heatmap(nba_players, scale = "column", dendrogram = "none",
    color = scales::col_quantile("Blues", NULL, 5))

d3heatmapThanks to integration with the dendextend package, you can customize dendrograms with cluster colors:

d3heatmap(nba_players, colors = "Blues", scale = "col",
    dendrogram = "row", k_row = 3)

d3heatmapFor issue reports or feature requests, please see our GitHub repo.

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