soccy 发表于 2015-2-6 05:41 
先看看这个吧:http://cran.at.r-project.org/web/packages/dplyr/vignettes/introduction.html
我正在学习你推荐的这个内容:Introduction to dplyr,包已加载成功,运行head(flights)也没有问题
但是运行如下都报错
filter(flights, month == 1, day == 1)
Error in match.arg(method) : object 'day' not found
filter(flights, month == 1 | month == 2)
Error in filter(flights, month == 1 | month == 2) : 
  object 'month' not found
In addition: Warning messages:
1: In data.matrix(data) : NAs introduced by coercion
2: In data.matrix(data) : NAs introduced by coercion
3: In data.matrix(data) : NAs introduced by coercion
4: In data.matrix(data) : NAs introduced by coercion
slice(flights, 1:10)
Error: could not find function "slice"
这是为什么呢?谢谢指点一下啊