将数据框拆分为多个输出文件 [英] Split dataframe into multiple output files

问题描述

我有一个大数据集（但以下是一个小数据集）。我可以拆分数据帧，然后将其输出到与用于拆分的lavel相对应的多个文本文件。

I have big dataset (but the following is small one for example). I can split the dataframe and then I want to output to multiple text file corresponding to lavel used to split.

mydata <- data.frame (var1 = rep(c("k", "l", "c"), each = 5), var2 = rnorm(5), 
      var3 = rnorm(5))
mydata    
   var1       var2       var3
1     k  0.5406022  0.3654706
2     k -0.6356879 -0.9160001
3     k  0.2946240 -0.1072241
4     k -0.2609121  0.1036626
5     k  0.6206579  0.6111655
6     l  0.5406022  0.3654706
7     l -0.6356879 -0.9160001
8     l  0.2946240 -0.1072241
9     l -0.2609121  0.1036626
10    l  0.6206579  0.6111655
11    c  0.5406022  0.3654706
12    c -0.6356879 -0.9160001
13    c  0.2946240 -0.1072241
14    c -0.2609121  0.1036626
15    c  0.6206579  0.6111655

现在拆分

> spt1 <- split(mydata, mydata$var1) 

> spt1

$c
   var1       var2       var3
11    c  0.5406022  0.3654706
12    c -0.6356879 -0.9160001
13    c  0.2946240 -0.1072241
14    c -0.2609121  0.1036626
15    c  0.6206579  0.6111655

$k
  var1       var2       var3
1    k  0.5406022  0.3654706
2    k -0.6356879 -0.9160001
3    k  0.2946240 -0.1072241
4    k -0.2609121  0.1036626
5    k  0.6206579  0.6111655

$l
   var1       var2       var3
6     l  0.5406022  0.3654706
7     l -0.6356879 -0.9160001
8     l  0.2946240 -0.1072241
9     l -0.2609121  0.1036626
10    l  0.6206579  0.6111655

我想以 outputc ， outputk 和 outputl 。因此，输出是通用前缀，后跟分组变量的标签名称。

I want to write.table in name of outputc, outputk, and outputl. Thus output is common prefix followed by name of label for grouping variable.

write.table (spt1) 

推荐答案

对spt1的名称使用lapply将使我们能够访问spt1中的数据帧以及可在粘贴中使用的名称来创建文件。 / p>

Using lapply over the names of spt1 will allow us to access the dataframes in spt1 and the name that we can use in paste to create our files.

lapply(names(spt1), function(x){write.table(spt1[[x]], file = paste("output", x, sep = ""))})

您可以在请粘贴。

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