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Making a barplot with known frequencies

Submitted by moldovean on February 4, 2012

Sorry for puting this silly question: I am reading the book "Using R for Introductory Statistics" and would like to create a barplot using this data

install.packages("UsingR")
library(UsingR)
head(scrabble)
 
   piece points frequency
1      A      1         9
4      B      3         2
7      C      3         2
10     D      2         4

The variable piece shows the letter, and the variable frequency its respective frequency in the scrabble game.
Specifically, I would like to have on the X axis the letters, and on the Y axis the frequencies.

Thank you in advance