There are several solutions to this.
One of them is to use sprintf
. This uses C
style formatting codes embedded in a character string to indicate the format of any other arguments passed to it. For example, the formatting code %3d
means format a number as integer of width 3:
a <- seq(1,101,25)
sprintf("name_%03d", a)
[1] "name_001" "name_026" "name_051" "name_076" "name_101"
Another is formatC
and paste
:
paste("name", formatC(a, width=3, flag="0"), sep="_")
[1] "name_001" "name_026" "name_051" "name_076" "name_101"