BG 9
pdf
School
University of British Columbia *
*We aren’t endorsed by this school
Course
COMM 205
Subject
Mathematics
Date
Jan 9, 2024
Type
Pages
4
Uploaded by BrigadierProton23752
Breakout Group (BG) 9
Due
Nov 8 at 11p.m.
Points
10
Questions
2
Available
Nov 8 at 12p.m. - Nov 8 at 11:59p.m.
11 hours and 59 minutes
Time Limit
None
Allowed Attempts
Unlimited
Instructions
This quiz was locked Nov 8 at 11:59p.m..
Attempt History
Attempt
Time
Score
LATEST
Attempt 1
11 minutes
10 out of 10
Score for this attempt:
10
out of 10
Submitted Nov 8 at 1:28p.m.
This attempt took 11 minutes.
Please submit your answers by the end of the class. Every student should submit their own answers.
Please use
this file
(https://canvas.ubc.ca/courses/123136/files/28052692?wrap=1)
(https://canvas.ubc.ca/courses/123136/files/28052692/download?download_frd=1)
for this BG exercise.
Please open up your RStudio first and then open the file in RStudio. If you click on the file directly,
your system might not recognize the file association.
5 / 5 pts
Question 1
A little bit of an overview for using Vectors in Arithmetic Operations:
An arithmetic operation between a vector and an atomic value:
Atomic value will be applied to each element of the vector
An arithmetic operation between two vectors
Operation is performed element-wise
In both cases, the result is a vector
Suppose we have a vector of cities, a vector for countries that they are
in and another vector for today's temperature (in Celsius) in those
cities. A given position in these vectors corresponds to the same city.
cities <- c("Vancouver", "Toronto", "New York",
"Los Angeles", "Dallas", "Phoenix",
"Tampa", "Winnipeg", "Saskatoon",
"Edmonton")
country <- c("Canadian","Canadian","American",
"American","American","American",
"American","Canadian","Canadian",
"Canadian")
today_temp_C <- c(10, 5, 2, 15, 25, 24, 20, -2, -5, -3)
Suppose tomorrow will be 2 degrees Celsius warmer than today.
Create a tomorrow_temp_F vector that would tell the temperature in
Fahrenheit in those cities tomorrow?
tomorrow_temp_F <- 1.8 * today_temp_C + 32 + 2
tomorrow_temp_F <- 1.8 * (today_temp_C + 2) + 32
Correct!
Correct!
tomorrow_temp_F <- 1.8(today_temp_C + 2) + 32
(tomorrow_temp_F - 32)/1.8 - 2 <- today_temp_C
5 / 5 pts
Question 2
A little bit of an overview for the implicit coercion in Arithmetic
Operations with Vectors:
If the vector's data type does not fit in the arithmetic operation, R will
Answer 1:
coerce its data type similar to atomic values in the context of arithmetic
operations. The order
logical --> integer --> double.
Assume again that today's temperatures for the cities are given.
However, suppose weather forecasts just changed. You were told that
tomorrow's temperature in Canadian cities will be
2
degrees Celsius
cooler
than today. However, temperature in American cities will be
1
degree Celsius
warmer
than today. Note that we are only provided with
either
American
or
Canadian cities.
What would be the tomorrow's temperature in Celsius in these cities?
Complete the code below:
today_temp_C - 2*(country == "Canadian") + 1*(country !=
"Canadian")
You can only use logical comparison operators or arithmetic operators
in each blank above.
Assume that the formula above is correctly completed. Answer the
following two questions regarding the data type of the segment of the
the completed formula?
What is the data type of the outcome of the expression in the second
parenthesis when the blank there is correctly filled;
That is
(country
XXX "Canadian")
?
logical
What is the data type of the outcome of the expression in the second
term of the entire line of code when the blank there is correctly filled;
That is
2*(country
XXX "Canadian")
?
double
Last two blanks are intended to show you how implicit coercion has
taken place.
Your preview ends here
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Answer 2:
Answer 3:
Answer 4:
==
Correct!
Correct!
!=
Correct!
Correct!
logical
Correct!
Correct!
double
Correct!
Correct!
Quiz Score:
10
out of 10