In R, how to split/subset a data frame by factors in one column?

按照某列的值拆分data.frame

 

My data is like this (for example):

ID Rate State 1 24 AL 2 35 MN 3 46 FL 4 34 AL 5 78 MN 6 99 FL

I want to split the data by state and I want to get 3 data sets like below:

data set 1 ID Rate State 1 24 AL 4 34 AL data set 2 ID Rate State 2 35 MN 5 78 MN data set 3 ID Rate State 3 46 FL 6 99 FL


split( df , df$State )
$AL
  ID Rate State
1  1   24    AL
4  4   34    AL

$FL
  ID Rate State
3  3   46    FL
6  6   99    FL

$MN
  ID Rate State
2  2   35    MN
5  5   78    MN


mylist <- split( df , df$State ) ; 
mylist[[1]]
mylist[[2]]
mylist[[3]]

REF:
http://stackoverflow.com/questions/19327020/in-r-how-to-split-subset-a-data-frame-by-factors-in-one-column