How to remove line numbers from data.table object in R?

To remove line numbers from data.table object in R, we can set row.names to FALSE and print the data.table object.

For Example, if we have a data.table object called DT then we can remove line numbers from DT by using the command given below −

print(DT,row.names=FALSE)

Example 1

To load data.table object and create an object use the following snippet to create a data frame −

library(data.table)
x1<-rnorm(20)
x2<-rnorm(20)
DT1<-data.table(x1,x2)
DT1

The following dataframe is created

            x1        x2
1:  -0.02658483  0.169448948
2:  -1.43115388 -0.864877686
3:  -0.50281119 -0.700596497
4:   1.38780360 -1.897366568
5:   0.35763631  0.478451912
6:  -0.35764002  0.214175540
7:  -0.20389025 -0.169978581
8:   1.57441418 -1.869871317
9:  -0.55489836  0.619942102
10: -2.00224453 -0.915234113
11: -0.75488901  0.533122831
12: -0.78726955  0.905360849
13:  0.12579643 -0.938330049
14: -0.63961706 -0.239780606
15: -1.94153891  0.001229949
16: -0.19457437  0.376066187
17:  1.59071927  0.348293746
18:  0.12191501  0.857503511
19: -0.67102720  0.799023371
20: -0.04910786  0.450912525

To remove row numbers from DT1 add the following code to the above snippet −

library(data.table)
x1<-rnorm(20)
x2<-rnorm(20)
DT1<-data.table(x1,x2)
print(DT1,row.names=FALSE)

Output

If you execute all the above given snippets as a single program, it generates the following Output −

       x1        x2
-0.02658483  0.169448948
-1.43115388 -0.864877686
-0.50281119 -0.700596497
 1.38780360 -1.897366568
 0.35763631  0.478451912
-0.35764002  0.214175540
-0.20389025 -0.169978581
 1.57441418 -1.869871317
-0.55489836  0.619942102
-2.00224453 -0.915234113
-0.75488901  0.533122831
-0.78726955  0.905360849
 0.12579643 -0.938330049
-0.63961706 -0.239780606
-1.94153891  0.001229949
-0.19457437  0.376066187
 1.59071927  0.348293746
 0.12191501  0.857503511
-0.67102720  0.799023371
-0.04910786  0.450912525

Example 2

Following snippet creates a sample data frame −

y1<-rpois(20,1)
y2<-rpois(20,5)
y3<-rpois(20,2)
DT2<-data.table(y1,y2,y3)
DT2

The following dataframe is created

   y1 y2 y3
1:  1 1  2
2:  1 9  4
3:  2 8  1
4:  3 6  0
5:  1 5  2
6:  1 5  2
7:  0 3  1
8:  1 6  4
9:  0 1  4
10: 0 8  5
11: 1 9  1
12: 0 1  2
13: 0 7  2
14: 1 9  2
15: 1 6  3
16: 0 5  3
17: 0 9  2
18: 0 3  0
19: 1 4  0
20: 1 3  3

To remove row numbers from DT2 on the above created data frame, add the following code to the above snippet −

y1<-rpois(20,1)
y2<-rpois(20,5)
y3<-rpois(20,2)
DT2<-data.table(y1,y2,y3)
print(DT2,row.names=FALSE)

Output

If you execute all the above given snippets as a single program, it generates the following Output −

y1 y2 y3
1  1  2
1  9  4
2  8  1
3  6  0
1  5  2
1  5  2
0  3  1
1  6  4
0  1  4
0  8  5
1  9  1
0  1  2
0  7  2
1  9  2
1  6  3
0  5  3
0  9  2
0  3  0
1  4  0
1  3  3