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How to create the combination of rows in two data frames having same columns in R?
To create the combination of rows in two data frames having same columns in R, we can follow the below steps −
- First of all, create two data frames.
- Then, combine the rows in the data frames with expand.grid and cbind with do.call.
Create the data frames
Let's create a data frame as shown below −
Class<-sample(c("I","II","III"),6,replace=TRUE)
Score<-sample(1:20,6)
df1<-data.frame(Class,Score)
df1On executing, the above script generates the below output(this output will vary on your system due to randomization) −
Class Score 1 III 1 2 III 13 3 III 10 4 I 2 5 II 7 6 II 17
Let’s create another data frame df2 as shown below −
Example
Class<-sample(c("I","II","III"),6,replace=TRUE)
Score<-sample(1:20,6)
df2<-data.frame(Class,Score)
df2Class Score 1 III 2 2 I 1 3 III 7 4 III 15 5 I 12 6 III 13
Combine rows of the data frames
Using cbind function with expand.grid and do.call function to combine the rows in df1 and df2 −
Class<-sample(c("I","II","III"),6,replace=TRUE)
Score<-sample(1:20,6)
df1<-data.frame(Class,Score)
Class<-sample(c("I","II","III"),6,replace=TRUE)
Score<-sample(1:20,6)
df2<-data.frame(Class,Score)
do.call(cbind.data.frame,Map(expand.grid,df1=df1,df2=df2))Output
Class.df1 Class.df2 Score.df1 Score.df2 1 III III 1 2 2 III III 13 2 3 III III 10 2 4 I III 2 2 5 II III 7 2 6 II III 17 2 7 III I 1 1 8 III I 13 1 9 III I 10 1 10 I I 2 1 11 II I 7 1 12 II I 17 1 13 III III 1 7 14 III III 13 7 15 III III 10 7 16 I III 2 7 17 II III 7 7 18 II III 17 7 19 III III 1 15 20 III III 13 15 21 III III 10 15 22 I III 2 15 23 II III 7 15 24 II III 17 15 25 III I 1 12 26 III I 13 12 27 III I 10 12 28 I I 2 12 29 II I 7 12 30 II I 17 12 31 III III 1 13 32 III III 13 13 33 III III 10 13 34 I III 2 13 35 II III 7 13 36 II III 17 13
Updated on: 14-Aug-2021
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