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A Grammar of Graphics for Kotlin.

Lets-Plot Kotlin API is a Kotlin API for Lets-Plot Multiplatform plotting library, which is built on the principles of layered graphics first described in the Leland Wilkinson work The Grammar of Graphics.

Lets-Plot Kotlin API is largely based on the API
provided by ggplot2 package well-known to data scientists who use R.

To learn more about the Grammar of Graphics,
we recommend an excellent book called
"ggplot2: Elegant Graphics for Data Analysis".

This will be a good prerequisite for further exploration of the Lets-Plot library.

Quick Start

Inside Kotlin Notebook, Datalore or Jupyter with Kotlin Kernel:

%use lets-plot

val rand = java.util.Random(37)
val data = mapOf (
    "rating" to List(200) { rand.nextGaussian() } + List(200) { rand.nextGaussian() * 1.5 + 1 },
    "cond" to List(200) { "A" } + List(200) { "B" }
)

letsPlot(data) { x = "rating"; fill = "cond" } + ggsize(700, 300) +
    geomDensity(color = "dark_green", alpha = .7) + scaleFillBrewer(type = "seq") +
    theme(panelGridMajorX = "blank")

You can read more about running Lets-Plot for Kotlin in notebooks and on different platforms here.

Last modified: 08 July 2024