Calculating quantiles in R

Question

How can the quantile be calculated? I tried the below formula:

quantile = p*(n+1) 

• here 'p' is the percentage 
• 'n' is the number of rows in a dataset

However, this doesn't seem to work.

Answer 1

You can follow this code:

y <- rnorm(100) #input data
quantile(y) 
quantile(y, c(0.1, 0.9))  # 10th and 90th centiles