Data Science for Engineers | Week 1
Session: JAN-APR 2024 / JULY-DEC 2023
Course Name: Data Science for Engineers
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These are NPTEL Data Science for Engineers Assignment 1 Answers
Q1. Which of the following variable names are INVALID in R?
1_variable
variable_1
_variable
variable@
Answer: 1_variable, _variable, variable@ [A, C, D]
Q2. The function ls() in R will
set a new working directory path
list all objects in our working environment
display the path to our working directory
None of the above
Answer: list all objects in our working environment
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These are NPTEL Data Science for Engineers Assignment 1 Answers
Consider a following code snippet. Based on this, answer questions 3 and 4.
Q3. Which of the following command is used to access the value “Shyam”?
print(patient list[3][2])
print(patient list[[3]][1])
print(patient list[[3]][2])
print(patient list[[2]][2])
Answer: print(patient list[[3]][2])
Q4. The output of the code given below is
a)
b)
c)
d) Code will throw an error.
Answer: b) [1] 4
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These are NPTEL Data Science for Engineers Assignment 1 Answers
Q5. What is the output of following code?
double
integer
list
None of the above
Answer: double
Q6. State whether the given statement is True or False.
The library reshape2 is based around two key functions named melt and cast
True
False
Answer: True
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These are NPTEL Data Science for Engineers Assignment 1 Answers
Q7. What is the output of following code?
6
4
2
8
Answer: 4
Create the data frame using the code given below and answer questions 8 and 9.
student data = data.frame(student id=c(1:4), student name=c(‘Ram’,‘Harish’,‘Pradeep’,‘Rajesh’))
Q8. Choose the correct command to add a column named student_dept to the dataframe student_data.
student datastudent dept = c(“Commerce”, “Biology”, “English”, “Tamil”)
student data[“student dept”] = c(“Commerce”,“Biology”, “English”,“Tamil”)
student dept= student data [c(“Commerce”,“Biology”,“English”,“Tamil”)]
None of the above
Answer: student datastudent dept = c(“Commerce”, “Biology”, “English”, “Tamil”)
student data[“student dept”] = c(“Commerce”,“Biology”, “English”,“Tamil”)
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These are NPTEL Data Science for Engineers Assignment 1 Answers
Q9. Choose the correct command to access the element Tamil in the dataframe student_data
student data[[4]]
student data[[4]][3]
student data[[3]][4]
None of the above
Answer: student data[[3]][4]
Q10. The command to check if a value is of numeric data type is _.
typeof()
is.numeric()
as.numeric()
None of the above
Answer: is.numeric()
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These are NPTEL Data Science for Engineers Assignment 1 Answers
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Session: JAN-APR 2023
Q1) The function “ ls()” in R will
a. set a new working directory path
b. list all objects in our working environment
c. display the path to our working directory
d. list all files in our working directory
Answer: b. list all objects in our working environment
Q2) Consider the following code:
If a room temperature of 20 degree Celsius is input to the above code, choose the output displayed:
a. “The room is chilly. Please turn the heater on!”
b. “The room is warm” “Enjoy the stay!”
c. “The room is hot” “Please turn the air conditioning on!”
d. None of the above
Answer: b. “The room is warm” “Enjoy the stay!”
These are NPTEL Data Science for Engineers Assignment 1 Answers
Q3) Consider the code below to create a dataframe city_data:
Choose the correct answer based on the output expected on running the below code.
a. In the column weather in dataframe city_data, “Rain” is replaced by “Snowy”
b. In the column name in dataframe city_data, “City C” is replaced by “Snowy”
c. No change occurs to the entries in the dataframe city_data
d. The code raises an error
Answer: a. In the column weather in dataframe city_data, “Rain” is replaced by “Snowy”
These are Data Science for Engineers Week 1 Assignment Answers
Q4) Consider the code given below.
Choose the correct command to access the variable “Cloudy”
a. city_weather[[4]][2]
b. city_weather[[5]]
c. city_weather[[2]][2]
d. None of the above
Answer: a. city_weather[[4]][2]
These are NPTEL Data Science for Engineers Assignment 1 Answers
Q5) Consider the following code.
A = matrix(c(1:42), nrow = 6, ncol = 7, byrow = T)
B = A[-2,]
Based on the output of the above code, choose the correct options from the following
a. B is a matrix consisting of only elements of the second row of matrix A
b. B is a matrix consisting of same elements as that of A
c. The code raises an error
d. B is a matrix consisting of all elements of A excluding the second row
Answer: a. B is a matrix consisting of only elements of the second row of matrix A
Q6) The parameter “collapse” in the function paste()
a. adjusts the display of the string to left, right or center
b. add space in between two strings
c. eliminates the space in between two strings
d. eliminates the space within two words in a string
Answer: b. add space in between two strings
These are NPTEL Data Science for Engineers Assignment 1 Answers
Q7) Consider the following code in R.
If we supply 4 as an argument to the function find.function, after executing the above code, the result displayed would be
a. the numbers “1,2,3,4”
b. the numbers “1,4,9,16”
c. the number “4”
d. None of the above
Answer: b. the numbers “1,4,9,16”
Q8) The operator %in% is used for
a. multiplication of a matrix with its transpose
b. generating a sequence of numbers in a vector
c. identifying if an element belongs to a vector
d. none of the above
Answer: c. identifying if an element belongs to a vector
These are NPTEL Data Science for Engineers Assignment 1 Answers
Q9) The output of compiling and executing the following code in R would be
a. The term “Green” “apple” printed 5 times.
b. The term “Green apple” printed 3 times.
c. The term “Green” printed 4 times
d. The term “Green” “apple” printed 4 times.
Answer: d. The term “Green” “apple” printed 4 times.
Q10) The “next” statement in R programming is useful
a. for skipping the current iteration of a loop without terminating it.
b. for terminating the current iteration of a loop.
c. for evaluating the current iteration of a loop without terminating it.
d. None of the above
Answer: a. for skipping the current iteration of a loop without terminating it.
These are NPTEL Data Science for Engineers Assignment 1 Answers
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