R Program - VIDYA VICHAR

Welcome to your R Program

How do you concatenate strings in R?

concat()

combine()

merge()

paste()

None

How do you create a matrix in R?

matrix()

create.matrix()

new_matrix()

mat()

None

How do you create a factor variable in R?

new.factor()

create.factor()

factor()

factorize()

None

How do you safely unwrap an optional in Swift?

unwrap(optional)

let value = optional!

if let value = optional { ... }

guard let value = optional { ... }

None

What is the function to calculate the sum of a vector in R?

sum()

aggregate()

add()

total()

None

What is the function to create a data frame in R?

data.frame()

dataframe()

create.dataframe()

new.data.frame()

None

Which function is used to calculate the standard deviation in R?

standard_deviation()

std_dev()

stdev()

sd()

None

How do you create a tuple in Swift?

let tuple = 1, "Hello"

let tuple = {"1": "Hello"}

let tuple = (1, "Hello")

let tuple = [1, "Hello"]

None

How do you create a list in R?

list()

create.list()

new.list()

c()

None

10.

Which function is used to apply a function to each element of a vector in R?

sapply()

lapply()

apply()

forEach()

None

11.

How do you read a CSV file in R?

csv.read()

open.csv()

load.csv()

read.csv()

None

12.

What is the file extension for R scripts?

.rscript

.rs

None

13.

Which function is used to merge two data frames in R?

union()

merge()

join()

combine()

None

14.

How do you assign a value to a variable in R?

variable = value

variable <- value

variable := value

variable => value

None

15.

How do you handle multiple errors in a single do-catch block in Swift?

catch { if error1 { ... } else if error2 { ... } }

catch { case error1: ... case error2: ... }

try-catch(error1, error2)

catch (error1, error2) { ... }

None

16.

How do you remove a column from a data frame in R?

remove.column(dataframe, column)

delete.column(dataframe, column)

dataframe$column <- NULL

drop.column(dataframe, column)

None

17.

How do you install a package in R?

install("package_name")

require("package_name")

load.packages("package_name")

install.packages("package_name")

None

18.

How do you remove NA values from a vector in R?

na.exclude()

na_delete()

na.omit()

na.remove()

None

19.

How do you create a plot in R?

create.plot()

graph()

plot()

draw()

None

20.

What does the @objc attribute in Swift indicate?

The method or property can only be used in macOS

The method or property can be accessed from Objective-C

The method or property can only be accessed from Swift

The method or property can only be used in iOS

None

21.

How do you calculate the correlation between two variables in R?

correlation()

cov()

cor()

cor.test()

None

22.

How do you concatenate two strings in Swift?

let result = string1 + string2

let result = string1.concat(string2)

let result = string1.append(string2)

let result = concatenate(string1, string2)

None

23.

How do you create a histogram in R?

graph.hist()

hist()

histogram()

create.hist()

None

24.

How do you write a single-line comment in Swift?

# This is a comment

/* This is a comment */

// This is a comment

None

25.

How do you get the first 6 rows of a data frame in R?

first()

beginning()

head()

top()

None

26.

How do you find the unique values in a vector in R?

unique()

unique.values()

distinct()

unique_items()

None

27.

Which function is used to calculate the mean of a vector in R?

mean_value()

mean_of()

average()

mean()

None

28.

How do you find the dimensions of a data frame in R?

size(dataframe)

shape(dataframe)

dim(dataframe)

len(dataframe)

None

29.

How do you create a sequence of numbers from 1 to 10 in R?

seq(1, 10)

sequence(1, 10)

1:10

seq(from=1, to=10)

None

30.

How do you save a plot as a PNG file in R?

save.png("filename")

export.png("filename")

png("filename.png")

plot.save("filename.png")

None

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