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NPTEL Data Science for Engineers Assignment 1 July 2024
Last date: 2024-08-07, 23:59 IST
Q1. Which of the following variable names are INVALID in R?
A. 1_variable
B. variable_1
C. _variable
D. variable@
Answer: A, C, D
Reason:
Q2. 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. None of the above
Answer: [ B ] list all objects in our working environment
Reason:
Consider the following code snippet. Based on this, answer questions 3 and 4.
ID = c (1, 2, 3, 4)
Patient_name = c ("Ram", "Shyam", "Nandini", "Maya")
num.patient = 4
patient_list = list (num.patient, ID, Patient_name) {codeBox}
Q3. Which of the following command is used to access the value “Shyam”?
A. print(patient_list[3][2])
B. print(patient_list[[3]][1])
C. print(patient_list[[3]][2])
D. print(patient_list[[2]][2])
Answer: [ C ] print(patient_list[[3]][2])
Reason:
Q4. The output of the code given below is
for ( i in patient_list[ 1 ] ) {
for ( j in i ) {
print ( j )
}
} {codeBox}
Answer: [ C ]
[ 1 ] 4
Q5. What is the output of following code?
x = 10 + 5 %% 3
print ( typeof (x) ) {codeBox}
A. double
B. integer
C. list
D. None of the above
Answer: [ A ] double
Reason:
Q6. State whether the given statement is True or False.
The library reshape2 is based around two key functions named melt and cast.
A. True
B. False
Answer: [ A ] True
Q7. What is the output of following code?
A = matrix ( c ( 9:1 ), 3, 3 )
print ( A [ 3, 2] ) {codeBox}
A. 6
B. 4
C. 2
D. 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.
A. student_datastudent dept=c(“Commerce”, “Biology”, “English”, “Tamil”)
B. student_data[“student dept”]= c(“Commerce”,“Biology”, “English”,“Tamil”)
C. student_dept= student data[c(“Commerce”,“Biology”,“English”,“Tamil”)]
D. None of the above
Answer: [ A ], [ B ]
Q9. Choose the correct command to access the element Tamil in the dataframe student_data.
A. student_data[[4]]
B. student_data[[4]][3]
C. student_data[[3]][4]
D. None of the above
Answer: [ C ] student_data[[3]][4]
Q10. The command to check if a value is of numeric data type is ________.
A. typeof()
B. is.numeric()
C. as.numeric()
D. None of the above
Answer: [ B ] is.numeric()
