Data Science for Engineers week 1 Nptel Assignment Answer

 Data Science for Engineers week 1 Nptel Assignment Answer

1 point

Which of the following variable names are INVALID in R?

 1_variable

 variable_1

 _variable

 variable@

1 point

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

Consider the following code snippet. Based on this, answer questions 3 and 4.

1 point

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])

1 point

The output of the code given below is

 

  Answer

 

 Code will throw an error

1 point

What is the output of following code?

 double

 integer

 list

 None of the above

1 point

State whether the given statement is True or False.
The library reshape2 is based around two key functions named melt and cast.

 True

 False

1 point

What is the output of following code?

 6

 4

 2

 8

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’))

1 point

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

1 point

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

1 point

The command to check if a value is of numeric data type is ____.

 typeof()

 is.numeric()

 as.numeric()

 None of the above