Description
Part1) Strings (60 points)
Use the stringr functions for the following:
Initialize the vector of words from Lincoln’s Gettysburg address with the
following code:
file <- “http://kalathur.com/cs544/data/lincoln.txt”
words <- scan(file, what=character())
a) Detect and show all the words that have a punctuation symbol.
b) Replace all the punctuations in the corresponding words with an empty
string. Make this the new words data.
c) Show the frequencies of the word lengths in the above data. Plot the
distribution of these frequencies.
d) What are the words with the longest length?
e) Show all the words that start with the letter p.
f) Show all the words that end with the letter r.
g) Show all the words that start with the letter p and end with the letter r.
Part2) Data Wrangling (40 points)
Use the tidyverse library for the following:
Download the following csv file,
http://people.bu.edu/kalathur/usa_daily_avg_temps.csv
locally first and use read.csv to load the data into a data frame.
a) Convert the data frame into a tibble and assign it to the variable
usaDailyTemps.
b) What are the maximum temperatures recorded for each year? Show the
values and also the appropriate plot for the results.
c) What are the maximum temperatures recorded for each state? Show the
values and also the appropriate plot for the results.
d) Filter the Boston data and assign it to the variable bostonDailyTemps.
e) What are the average monthly temperatures for Boston? Show the
values and also the appropriate plot for the results.
Submission:
Create a folder, CS544_HW6_lastName and place the following file in this
folder.
Provide the R code, HW6_lastName.R, with each portion of the code
clearly identified by the corresponding question. Prepare a corresponding
word document by pasting the output for each question
(HW6_lastName.docx)
Archive the folder (CS544_HW6_lastName.zip). Upload the zip file to
the Assignments section of Blackboard.
