The data sets
city.name
,
city.state
,
city.x
, and
city.y
contain the names and locations of 109 cities in the United States. The cities cover the geographical regions of the U.S. and were not chosen by population.
city.x
vector is negative longitude corresponding to a coordinate system set up by the
usa
function. The
city.y
vector is latitude. Both vectors are measured in degrees.