How to convert first letter into capital in single column data.table object in R using dplyr?

R Programming Server Side Programming Programming

To convert first letter into capital in single column data.table object in R, we can follow the below steps −

First of all, create a data.table object with string column.
Then, use sub function along with mutate function of dplyr package to convert first letter into capital in string column.

Example

Create the data.table object

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

library(data.table)
Names<-
sample(c("rahul","rosy","hidayah","seema","john","sarbat","shaun","sam","teena","ila","kunal","sudha","anil","yukti","jerry","tom"),25,replace=TRUE)
DT<-data.table(Names)
DT

Output

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

    Names
1:  teena
2:  teena
3:  seema
4:  shaun
5:  shaun
6:  hidayah
7:  rosy
8:  kunal
9:  tom
10: shaun
11: ila
12: rahul
13: sam
14: rahul
15: teena
16: jerry
17: yukti
18: rosy
19: anil
20: hidayah
21: shaun
22: seema
23: sudha
24: sam
25: anil
    Names

Convert first letter into Capital

Using sub function along with mutate function of dplyr package to convert first letter into capital in Names column −

library(data.table)
Names<-
sample(c("rahul","rosy","hidayah","seema","john","sarbat","shaun","sam","teena","ila","kunal","sudha","anil","yukti","jerry","tom"),25,replace=TRUE)
DT<-data.table(Names)
library(dplyr)
DT %>% mutate(Names=sub("(.)","\\U\\1",DT$Names,perl=TRUE))

Output

    Names
1:  Teena
2:  Teena
3:  Seema
4:  Shaun
5:  Shaun
6:  Hidayah
7:  Rosy
8:  Kunal
9:  Tom
10: Shaun
11: Ila
12: Rahul
13: Sam
14: Rahul
15: Teena
16: Jerry
17: Yukti
18: Rosy
19: Anil
20: Hidayah
21: Shaun
22: Seema
23: Sudha
24: Sam
25: Anil
    Names

Nizamuddin Siddiqui

Published on 10-Nov-2021 06:31:27

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