摘要：
> x<-1:3 > typeof(x) [1] "integer" > y<-c(1,3,4) > typeof(y) [1] "double" > x==y [1] TRUE FALSE FALSE > all(x==y) [1] FALSE > x<-1:3 > typeof(x) [1] " 阅读全文
摘要：
grep(pattern, x, ignore.case = FALSE, perl = FALSE, value = FALSE, fixed = FALSE, useBytes = FALSE, invert = FALSE) grepl(pattern, x, ignore.case = FA 阅读全文