index – Programming classes

Getting help

You can get help about a package or function with the function help(). Just put the quoted name of the package/function inside the parenthesis.

Working with numbers

Functions for numeric data

Sequences and repetitions

Use the command seq to get a sequence of numbers. You can specify the interval between every number shown. The function is writen as: seq(FROM, TO, INTERVAL)

Overview data

See data structure. Shows number of rows and columns in a data frame, classes of the columns, first few elements of each column.

Resources

Extended reading

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Objects and packages

To know what packages you have installed, their versions and dependencies, you can use the function installed.packages(). This returns a table with information about the…

Open files

These functions are available without loading any package

Excel files in R

Excel import and export

If you have only one sheet in a spreadsheet, the easiest thing to do is to save it as .csv or .txt and open it with read.XXXX or read_XXXX. Spreadsheets use more space and…

Working with text

Text manipulation

These are ways to search text without writing the explicitly what you are searching.