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

问题描述

我有大数据集(但例如以下是小数据集).我可以拆分数据帧，然后我想输出到与用于拆分的 lavel 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

现在分开

> 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的名义写.table.因此，输出是通用前缀，后跟用于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

在 spt1 的名称上使用 lapply 将允许我们访问 spt1 中的数据帧以及我们可以在粘贴中使用的名称来创建我们的文件.

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 = ""))})

如果需要，您可以在粘贴中添加通用扩展名.

You could add a common extension in the paste if you want.

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