Techie Notes

Add R Plots to LaTeX Documents

Tagged: latex

Here I am showing how to go from data stored in csv file to a nice plot in a LaTeX document using ggplot2 package from R.

My goal was:

  1. Import csv file with data
  2. Create a plot in R
  3. Make this plot available in LaTeX document

Prerequisites

  • LaTeX is installed – sudo apt-get install texlive-full
  • R is installed – sudo apt-get install r-base

Configuring R

get to R console with R

> install.packages("tikzDevice", "ggplot2")

Making a Plot and Saving it as LaTeX File

Assuming I have a csv file like this:

parser,threads,mph
gnparser,1,21.4
gnparser,2,41.1
gnparser,4,73.8
gnparser,8,89.3
gnparser,12,93.8
gbif,1,23.0
gbif,2,45.5
gbif,4,76.3
gbif,8,111.5
gbif,12,114.6
biodiv,1,4.0
biodiv,2,6.2
biodiv,4,9.2
biodiv,8,10.0
biodiv,12,9.1

These data show parsing millions of names per hour, but in the plot I need data of names parsed per second

plot.R file:

#!/usr/bin/env Rscript

require(ggplot2)
require(tikzDevice)

data <- read.csv("plot.csv")

nps <- function(d) { d * 1000000 / 3600 }

tikz("../../throughput.tex",width=5,height=5)

ggplot(data=data, aes(x=threads, y=nps(mph),
       group=parser, shape=parser)) +
  geom_line(size=0.5) + geom_point(size=3) +
  xlab("CPU Threads") + ylab("Names/Second") +
  scale_shape_discrete(name="Parser",
                       breaks=c("gnparser","biodiversity","gbif-parser")) +
  scale_x_discrete(breaks=seq(0,13,2)) +
  theme(
      legend.key = element_rect(fill = "white"),
      legend.background = element_rect(fill = "white", color="black", size=0.3),
      legend.position = c(0.8,0.35),
      panel.grid.major = element_line(colour = "white"),
      axis.line = element_line(colour = "black"),
      axis.ticks = element_line(colour = "black"),
      axis.text = element_text(colour = "black", size = 10),
      panel.grid.minor = element_blank(),
      panel.background = element_rect(fill = "white")
    )
dev.off()

Note the height and width parameters for tikz() function – they were needed to scale the plot down. After the file is created it can be included into a LaTeX document:

...

\usepackage{tikz}
...

\begin{figure}[htbp]
  \begin{center}
    \caption{Names parsed per second by GN, GBIF and Biodiversity parsers (runing on 1-12 parallel threads).
    }\label{figure:throughput}
    \include{throughput}
  \end{center}
\end{figure}

Tikz Plot