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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)

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