Packages/plots

Question 1

Install packages?

Answer 1

install.packages(“”)

Question 2

Confirmation message of loading the package/load installed package?

Answer 2

require()

Question 3

No confirmation message but load package?

Answer 3

library()

Question 4

Loading many packages simultaneously with pacman?

Answer 4

pacman : : o_load()

Question 5

Clean up a package with pacman?

Answer 5

p_unload()

Question 6

Clean up base packages?

Answer 6

detach (“”, unload = TRUE)

Question 7

Get help in something?

Answer 7

?function

Question 8

Plotting on a specific categorical variable?

Answer 8

plot(dataset$Var)

Question 9

Plotting a quantitative variable?

Answer 9

plot(dataset$Var.Var)

Question 10

Plot with two variables?

Answer 10

plot(dataset$Var, dataset$Var)

Question 11

Plot the entire dataset?

Answer 11

plot(dataset)

Question 12

Plotting mathematical formulas?

Answer 12

plot(function, min, max)

Question 13

Bar plot?

Answer 13

barplot(

Question 14

Histogram?

Answer 14

hist(dataset)

Question 15

Put graphs in x rows and y columns?

Answer 15

par(mfrow = c(x, y))

Question 16

Histogram with a selector (restriction)?

Answer 16

hist(dataset$Var [dataset$var == “var”])

Question 17

What returns the first or last parts of a vector, matrix, table, data frame or function?

Answer 17

head()

Question 18

How to figure out class or data type for each column?

Answer 18

sapply(data, class)

Question 19

how to make a table in R a database?

Answer 19

attach(var)

Question 20

Reading text file in R?

Answer 20

read.table(“filename.txt”)