Appendix D — Code topics

This appendix gathers together links to parts of the book that cover various code topics in R:

• Comments: Note 2.2 and Note 7.2.
• Variables: Section 4.6.
• Types of values in R: Section 7.3.
• Strings — values containing text: Section 7.4.
• Randomness from your computer: Section 2.2.
• Types of brackets in R: Note 4.2.
• vector length: Section 6.5.
• Squaring values and vectors: Section 16.7.1.
• Indexing into vectors with integers: Section 6.6.
• Selecting multiple elements from vectors with slicing: Section 10.2.
• Introducing functions: Section 5.7.
• Named arguments to functions: Section 5.8.
• Functions and methods: ?nte-functions-methods.
• Ranges (continuous sequences) of integers: Section 5.9.
• Advanced ranges (for example, using floating point values), using seq: Note 21.6.
• The absolute function (abs) to convert all values to positive: Note 16.3.
• Repeating elements of a vector with rep: Section 7.6}
• for loops: Section 6.6.2.
• if statements: Section 8.10.
• Finding number of repeats using tabulate: Section 11.6
• Combining Boolean vectors with &: Section 10.6
• Testing whether all elements of a vector are the same using all: Note 13.5
• Plotting and histograms (and histogram bins and bin edges): Section 12.15.2.
• Shuffling vectors with sample: Section 8.14.
• Choosing values at random with sample: Section 5.10.
• Counting TRUE values with sum: Section 5.13.
• Making vectors by random resampling with sample: Section 5.11.
• Building strings with paste: Section 21.1.1.
• What is an operator?: Note 23.2.
• Logical operators — or(|), and(&): Section 23.1.
• Concatenating vectors: Section 12.15.1.
• The Comma-Separated-Values (CSV) file format for data tables: Section 16.1.1.