Song titles and lengths of U2 albums from 1980 to 1997.
U2专辑的歌曲标题,长度1980~1997年。
用法----------Usage----------
data(u2)
格式----------Format----------
The data is stored as a list with names. Each list entry correspond to an album stored as a vector. The values of the vector are the song lengths in seconds and the names are the track titles.
的数据被存储为名称的列表与。每个列表条目对应于一个存储为矢量的专辑。该矢量的值是在几秒钟的歌曲长度和名称的音轨标题。
源----------Source----------
http://www.u2station.com/u2ography.html
实例----------Examples----------
data(u2)
sapply(u2,mean) # average track length[平均径迹长度]
max(sapply(u2,max)) # longest track length[轨道长度最长]
sort(unlist(u2)) # lengths in sorted order[长度排序]