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

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

• First of all, create a data.table object with string column.

• Then, use sub function to convert first letter into capital in string column.

Example

Create the data.table object

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

library(data.table) Countries<- sample(c("india","china","russia","croatia","uk","usa","sudan","nepal","korea","germany","iceland"),25,replace=TRUE) DT<-data.table(Countries) DT

Output

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

 Countries 1: nepal 2: india 3: india 4: nepal 5: india 6: korea 7: germany 8: germany 9: sudan 10: iceland 11: india 12: india 13: nepal 14: korea 15: korea 16: nepal 17: croatia 18: nepal 19: usa 20: croatia 21: usa 22: india 23: nepal 24: germany 25: russia Countries

Convert first letter into Capital

Using sub function to convert first letter into capital in Countries column −

library(data.table) Countries<- sample(c("india","china","russia","croatia","uk","usa","sudan","nepal","korea","germany","iceland"),25,replace=TRUE) DT<-data.table(Countries) DT$Countries_new<-sub("(.)", "\U\1",DT$Countries,perl=TRUE) DT

Output

 Countries Countries_new 1: nepal Nepal 2: india India 3: india India 4: nepal Nepal 5: india India 6: korea Korea 7: germany Germany 8: germany Germany 9: sudan Sudan 10: iceland Iceland 11: india India 12: india India 13: nepal Nepal 14: korea Korea 15: korea Korea 16: nepal Nepal 17: croatia Croatia 18: nepal Nepal 19: usa Usa 20: croatia Croatia 21: usa Usa 22: india India 23: nepal Nepal 24: germany Germany 25: russia Russia Countries Countries_new