Easily Tidy Data with `spread()` and `gather()` Functions

Documentation for package ‘tidyr’ version 0.4.1

complete	Complete a data frame with missing combinations of data.
crossing	Expand data frame to include all combinations of values
expand	Expand data frame to include all combinations of values
extract	Extract one column into multiple columns.
extract_numeric	Extract numeric component of variable.
fill	Fill in missing values.
full_seq	Create the full sequence of values in a vector.
gather	Gather columns into key-value pairs.
nest	Nest repeated values in a list-variable.
nesting	Expand data frame to include all combinations of values
replace_na	Replace missing values
separate	Separate one column into multiple columns.
spread	Spread a key-value pair across multiple columns.
unite	Unite multiple columns into one.
unnest	Unnest a list column.