Combine Multiple Columns into One in R Data Frame

To combine multiple columns into one in R data frame without using column names, we can follow the below steps −

• First of all, create a data frame.
• Then, convert the data frame into a single column data frame.
• Again, convert the data frame into a single column without column names displayed in rows using row.names function.

Create the data frame

Let's create a data frame as shown below −

Example

 Live Demo

x<-sample(1:50,5)
y<-sample(1:50,5)
z<-sample(1:50,5)
a<-sample(1:50,5)
b<-sample(1:50,5)
c<-sample(1:50,5)
df<-data.frame(x,y,z,a,b,c)
df

On executing, the above script generates the below output(this output will vary on your system due to randomization) −

Output

  x  y z  a  b  c
1 48 6 8 48 49 22
2 7 34 48 28 17 17
3 25 40 1 22 12 29
4 38 21 27 33 8 5
5 5 20 7 50 46 32

Convert the data frame into a single column data frame

Using unlist function to convert df into a single data frame −

Example

 Live Demo

x<-sample(1:50,5)
y<-sample(1:50,5)
z<-sample(1:50,5)
a<-sample(1:50,5)
b<-sample(1:50,5)
c<-sample(1:50,5)
df<-data.frame(x,y,z,a,b,c)
data.frame(unlist(df))

Output

unlist.df.
x1 48
x2 7
x3 25
x4 38
x5 5
y1 6
y2 34
y3 40
y4 21
y5 20
z1 8
z2 48
z3 1
z4 27
z5 7
a1 48
a2 28
a3 22
a4 33
a5 50
b1 49
b2 17
b3 12
b4 8
b5 46
c1 22
c2 17
c3 29
c4 5
c5 32

Convert the data frame into a single column data frame without column names

Using unlist function to convert df into a single data frame without row numbers represented by column names −

Example

 Live Demo

x<-sample(1:50,5)
y<-sample(1:50,5)
z<-sample(1:50,5)
a<-sample(1:50,5)
b<-sample(1:50,5)
c<-sample(1:50,5)
df<-data.frame(x,y,z,a,b,c)
data.frame(One=unlist(df,use.names=FALSE))

Output

 One
1 48
2 7
3 25
4 38
5 5
6 6
7 34
8 40
9 21
10 20
11 8
12 48
13 1
14 27
15 7
16 48
17 28
18 22
19 33
20 50
21 49
22 17
23 12
24 8
25 46
26 22
27 17
28 29
29 5
30 32