2014-02-19 70 views
1

假設我有此R數據幀:按列的創建基於組的數據幀的子集的矢量

   ts year month day 
1 1295234818000 2011  1 17 
2 1295234834000 2011  1 17 
3 1295248650000 2011  1 17 
4 1295775095000 2011  1 23 
5 1296014022000 2011  1 26 
6 1296098704000 2011  1 27 
7 1296528979000 2011  2 1 
8 1296528987000 2011  2 1 
9 1297037448000 2011  2 7 
10 1297037463000 2011  2 7 

dput(a) 
structure(list(ts = c(1295234818000, 1295234834000, 1295248650000, 
1295775095000, 1296014022000, 1296098704000, 1296528979000, 1296528987000, 
1297037448000, 1297037463000), year = c(2011, 2011, 2011, 2011, 
2011, 2011, 2011, 2011, 2011, 2011), month = c(1, 1, 1, 1, 1, 
1, 2, 2, 2, 2), day = c(17, 17, 17, 23, 26, 27, 1, 1, 7, 7)), .Names = c("ts", 
"year", "month", "day"), row.names = c(NA, 10L), class = "data.frame") 

有一種方法來創建數據幀的向量,其中每一個是的一個子集獨特的年份,月份和日期組合的原創?理想情況下,我想找回數據幀DF1,DF2,DF3,DF4,DF5和DF6,按照這個順序,其中:

DF1:

   ts year month day 
1 1295234818000 2011  1 17 
2 1295234834000 2011  1 17 
3 1295248650000 2011  1 17 

DF2:

4 1295775095000 2011  1 23 

DF3:

5 1296014022000 2011  1 26 

DF4:

6 1296098704000 2011  1 27 

DF5:

7 1296528979000 2011  2 1 
8 1296528987000 2011  2 1 

DF6:

9 1297037448000 2011  2 7 
10 1297037463000 2011  2 7 

任何幫助,將不勝感激。

+0

使用當天的分裂功能。看看這篇文章:http://stackoverflow.com/a/16038343/3248346 –

+1

此外,'互動'可能是有用的,如果我明白你想要的東西正確。像'split(a,交互($ year,$ month,$ day,drop = T))''。 –

+2

@alexis_laz - 'drop = TRUE'也可以作爲參數直接傳遞給'split',所以這也可以工作:'with(a,split(a,list(year,month,day),drop = TRUE ))' – thelatemail

回答

1
df <- df[order(df$year, df$month, df$day), ] 
df.list <- split(df, list(df$year, df$month, df$day), drop=TRUE) 
listnames <- setNames(paste0("DF", 1:length(df.list)), sort(names(df.list))) 
names(df.list) <- listnames[names(df.list)] 
list2env(df.list, envir=globalenv()) 

# > DF1 
#    ts year month day 
# 1 1.295235e+12 2011  1 17 
# 2 1.295235e+12 2011  1 17 
# 3 1.295249e+12 2011  1 17 
# > DF6 
#    ts year month day 
# 9 1.297037e+12 2011  2 7 
# 10 1.297037e+12 2011  2 7 

編輯:

由於@thelatemail建議,同樣可以通過split正確排序來archieved簡單:

df.list <- with(df, split(df, list(day,month,year), drop=TRUE)) 
df.list <- setNames(df.list, paste0("DF",seq_along(df.list))) 
list2env(df.list, envir=globalenv()) 
+0

不需要所有的排序,只需改變'split' - 'df.list < - 用(a,split(a,list(day,month,year),drop = TRUE))'然後的順序按順序命名 - setNames(df.list,paste0(「DF」,seq_along(df.list)))' – thelatemail

+0

@thelatemail好主意,謝謝。我做了一個編輯。 – lukeA

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