Pyramid Stack2

Authors

[Editor] Hu Zheng;

[Contributors]

Modified

2026-01-17

Note

Hiplot website

This page is the tutorial for source code version of the Hiplot Pyramid Stack2 plugin. You can also use the Hiplot website to achieve no code ploting. For more information please see the following link:

https://hiplot.cn/basic/pyramid-stack2?lang=en

The pyramid stack is a pyramid-like figure that distributes data on both sides of a central axis.

Setup

System Requirements: Cross-platform (Linux/MacOS/Windows)
Programming language: R
Dependent packages: data.table; jsonlite; plotrix; ggplotify

# Install packages
if (!requireNamespace("data.table", quietly = TRUE)) {
  install.packages("data.table")
}
if (!requireNamespace("jsonlite", quietly = TRUE)) {
  install.packages("jsonlite")
}
if (!requireNamespace("plotrix", quietly = TRUE)) {
  install.packages("plotrix")
}
if (!requireNamespace("ggplotify", quietly = TRUE)) {
  install.packages("ggplotify")
}

# Load packages
library(data.table)
library(jsonlite)
library(plotrix)
library(ggplotify)

sessioninfo::session_info("attached")

─ Session info ───────────────────────────────────────────────────────────────
 setting  value
 version  R version 4.5.2 (2025-10-31)
 os       Ubuntu 24.04.3 LTS
 system   x86_64, linux-gnu
 ui       X11
 language (EN)
 collate  C.UTF-8
 ctype    C.UTF-8
 tz       UTC
 date     2026-01-17
 pandoc   3.1.3 @ /usr/bin/ (via rmarkdown)
 quarto   1.8.27 @ /usr/local/bin/quarto

─ Packages ───────────────────────────────────────────────────────────────────
 package    * version date (UTC) lib source
 data.table * 1.18.0  2025-12-24 [1] RSPM
 ggplotify  * 0.1.3   2025-09-20 [1] RSPM
 jsonlite   * 2.0.0   2025-03-27 [1] RSPM
 plotrix    * 3.8-13  2025-11-15 [1] RSPM

 [1] /home/runner/work/_temp/Library
 [2] /opt/R/4.5.2/lib/R/site-library
 [3] /opt/R/4.5.2/lib/R/library
 * ── Packages attached to the search path.

──────────────────────────────────────────────────────────────────────────────

Data Preparation

# Load data
data <- data.table::fread(jsonlite::read_json("https://hiplot.cn/ui/basic/pyramid-stack2/data.json")$exampleData$textarea[[1]])
data <- as.data.frame(data)

# Convert data structure
agegrps <- unique(data[,1])
split_var <- unique(data[,2])
dat_left <- as.matrix(data[data[,2] == split_var[1],-c(1,2)])
dat_right <- as.matrix(data[data[,2] == split_var[2],-c(1,2)])

# View data
head(data)

  Month Year Class1 Class2 Class3 Class4
1     1 2019      8    6.0      8    6.0
2     2 2019      4    2.0      4    2.0
3     3 2019      4    4.5      1    4.5
4     4 2019      6    8.0      1    9.0
5     5 2019      8    6.0      8    6.0
6     6 2019      4    2.0      4    2.0

Visualization

# Pyramid Stack2
p <- as.ggplot(function() {
  cols <- c("#E64B35FF","#4DBBD5FF","#00A087FF","#3C5488FF")
  names(cols) <- colnames(dat_left)
  cols <- cols[1:ncol(dat_left)]
  pyramid.plot(dat_left, dat_right, labels = agegrps, unit = "Value",
               lxcol = cols, rxcol = cols,
               laxlab=as.numeric(c(0,10,20,30)), raxlab=as.numeric(c(0,10,20,30)),
               top.labels=c(split_var[1], colnames(data)[1], split_var[2]),
               gap=4, ppmar=c(4,2,4,7), do.first="plot_bg(\"#FFFFFF\")")
  mtext("Porridge temperature by age and sex of bear", 3, 2, cex=1)
  legend("right", inset=c(-0.25,0), legend = colnames(dat_left), fill = cols)
  })

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