Instant Heat Maps in R How-to

Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "To add tool tips to our heat map, the HeatModSVG program will prompt us for a data file in addition to the SVG file that we want to modify."

A block of code is set as follows:

if (!require("gplots")) {
install.packages("gplots", dependencies = TRUE)
library(gplots)
}
if (!require("MASS")) {
install.packages("MASS", dependencies = TRUE)
library(MASS)
}

When we wish to draw your attention to a ...