Data Science Desktop Survival Guide
by Graham Williams
Adding a Flowchart
Raw LaTeX and R both support extensive capability for generating pictures. Here we use the diagram package to draw a flow chart, something that is a common requirement in documentation. The simple example shows the process of converting a .Rnw file using knitr to a LaTeX file which can then be processed by pdflatex to generate the .pdf file. The result can be seen in Figure 22.2.
# Load package from the local library into the R session.
# Identify some names for the nodes of the flowchart.
names <- c(".Rnw", ".tex", ".pdf")
# Set up the connectivity data.
connect <- c(0, 0, 0,
"knitr", 0, 0,
0, "pdflatex", 0)
# Constract a connectivity matrix and plot the flowchart.
matrix(nrow=3, ncol=3, byrow=TRUE, data=connect) %>%
plotmat(pos=c(1, 2), name=names, box.col="orange")
There are many more possibilities provided by diagram and if interested you can explore demo(plotmat) and demo(plotweb).