How to remove rows in data.table object in R that contains a specific number?

To remove rows in data.table object in R that contains a specific number, we can follow the below steps −

• First of all, create a data.table object.

• Then, use single square subsetting with apply function to remove rows that contains a specific number.

Example

Create the data.table object

Let’s create a data.table object as shown below: −

library(data.table)
x<-sample(1:25,25)
y<-sample(1:25,25)
z<-sample(1:25,25)
DT<-data.table(x,y,z)
DT

Output

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

    x   y z
1:  24  3 24
2:  23  5 11
3:   2  2  8
4:  10  4  9
5:  21 12 20
6:   4 18 16
7:  11 19 19
8:   6 21 17
9:   9 23 23
10:  8  6 2
11: 20  7 15
12:  7 22 22
13: 13 17  4
14: 15 14 13
15: 25 16 14
16: 16  9 12
17:  1 24  5
18:  3 11 10
19: 19 20 25
20: 22 10  3
21: 14 25  7
22: 12  8  1
23: 18  1 18
24: 17 15 21
25:  5 13  6
    x  y  z

Remove rows that contains a specific number

Using single square subsetting with apply function to remove rows that contains 10 in data.table object DT −

library(data.table)
x<-sample(1:25,25)
y<-sample(1:25,25)
z<-sample(1:25,25)
DT<-data.table(x,y,z)
DT[!apply(DT==10,1,any),]

Output

     x  y  z
1:  24  3 24
2:  23  5 11
3:   2  2  8
4:  21 12 20
5:   4 18 16
6:  11 19 19
7:   6 21 17
8:   9 23 23
9:   8  6  2
10: 20  7 15
11:  7 22 22
12: 13 17  4
13: 15 14 13
14: 25 16 14
15: 16  9 12
16:  1 24  5
17: 19 20 25
18: 14 25  7
19: 12  8  1
20: 18  1 18
21: 17 15 21
22:  5 13  6
    x  y  z

Nizamuddin Siddiqui

Updated on: 10-Nov-2021

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