Data Science for Engineers | Week 1

Session: JUL-DEC 2024

Course name: Data Science for Engineers

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These are Data Science for Engineers Week 1 Assignment Nptel Answers


Q1. Which of the following variable names are INVALID in R?
1_variable
variable_1
_variable
variable@

Answer: 1_variable, variable@


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 Data Science for Engineers Week 1 Assignment Nptel Answers


Q3.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”)
12345670
num.patient = 4
patient_list = list(num.patient, ID, Patient_name)

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: C)print(patient_list[[3]][2])


Q4.The output of the code given below is
for (i in patient_list[1]){
for (jin i){ print(j) }
}

Answer: B)


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These are Data Science for Engineers Week 1 Assignment Nptel 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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See also  Data Science for Engineers | Week 7

These are Data Science for Engineers Week 1 Assignment Nptel Answers


Q7. What is the output of following code?
A = matrix(c(9:1), 3, 3)
print(A[3, 2])

6
4
2
8

Answer: 6


Q8. 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’))

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: B)student_data[“student dept”]= c(“Commerce”,“Biology”, “English”,“Tamil”)


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These are Data Science for Engineers Week 1 Assignment Nptel 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: None of the above


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 Data Science for Engineers Week 1 Assignment Nptel Answers

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These are Data Science for Engineers Week 1 Assignment Nptel Answers