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我有下列R-数据帧MYDATAgrep的R中删除整行,如果城市列单元格为空
session first last city
1 9cf571c8faa67cad2aa9ff41f3a26e38 cat+rat biddix fresno
2 e30f853d4e54604fd62858badb68113a caleb amos
3 2ad41134cc285bcc06892fd68a471cd7 daniel+joe folkers
4 2ad41134cc285bcc06892fd68a471cd7 daniel+joe folkers
5 63a5e839510a647c1ff3b8aed684c2a5 charles pierce flint
6 691df47f2df12f14f000f9a17d1cc40e j franz prescott+valley
7 691df47f2df12f14f000f9a17d1cc40e j franz prescott+valley
8 b3a1476aa37ae4b799495256324a8d3d carr%ie% mascorro brea
9 bd9f1404b313415e7e7b8769376d2705 fred morales las+vegas
10 b50a610292803dc302f24ae507ea853a aurora lee
11 fb74940e6feb0dc61a1b4d09fcbbcb37 andrew price yorkville
什么是代码正确的行删除所有这些行,其中城市为空白?
`!grepl()`是一个很不错的临时`invert`;) – 2011-12-15 23:46:53
@ JoshO'Brien:doh! – 2011-12-15 23:52:12