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

Now split 

> 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

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)
r split dataframe
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