[R] Numbers as symbols

[Nick Drew]

I want to use question numbers from my survey data
(fake data below) as markers in a scatterplot. I'm
using "as.character" to convert question numbers to
characters. However, plot truncates the 0 (zero) off
of question 10. How can I get the ending zero so I can
add questions 11 - 20?
 
# Sample code below
Question <- c(1,2,3,4,5,6,7,8,9,10)
Performance <-
c(3.5,3.6,3.7,3.8,3.9,4,4.1,4.2,4.3,4.4)
Importance <-
c(0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,0.99)
Survey <-
data.frame(cbind(Question,Performance,Importance))
 
nums <-as.character(Question)
plot(Performance, Importance, xlab='Graph',
ylab='',pch=nums, axes=T)
 
 
Thanks in advance for your help.
 
~Nick