Labels and titles in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a main title to the plot.

R Programming

plot(1:5, 1:5, main=[1])

Drag options to blanks, or click blank then click option'

A"My Plot"

Btitle

Cxlab

Dylab

Attempts:

3 left

💡 Hint

Common Mistakes

Using title instead of a string for the main argument.

Forgetting quotes around the title text.

The 'main' argument sets the main title of the plot. It requires a string, so use quotes around the title text.

2fill in blank

medium

Complete the code to add labels to the x and y axes.

R Programming

plot(1:5, 1:5, xlab=[1], ylab=[2])

Drag options to blanks, or click blank then click option'

A"X Axis"

Bmain

Ctitle

Dlabel

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'main' instead of 'xlab' or 'ylab'.

Not using quotes around the label text.

The 'xlab' and 'ylab' arguments set the labels for the x and y axes respectively. They need text strings in quotes.

3fill in blank

hard

Fix the error in the code to add a subtitle to the plot.

R Programming

plot(1:5, 1:5, sub=[1])

Drag options to blanks, or click blank then click option'

ASubtitle

Bsub_title

C"Subtitle"

Dsubtitle

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the subtitle text.

Using incorrect argument names like 'subtitle' or 'sub_title'.

The 'sub' argument adds a subtitle and requires a string in quotes. Without quotes, R treats it as a variable name causing an error.

4fill in blank

hard

Fill both blanks to add a main title and axis labels to the plot.

R Programming

plot(1:5, 1:5, main=[1], xlab=[2], ylab=[2])

Drag options to blanks, or click blank then click option'

A"Main Title"

B"X Label"

C"Y Label"

D"Axis Label"

Attempts:

3 left

💡 Hint

Common Mistakes

Using different labels for xlab and ylab when the task wants the same.

Not using quotes around the text.

The 'main' argument sets the main title, and 'xlab' and 'ylab' set the axis labels. Here, both axes share the same label.

5fill in blank

hard

Fill all three blanks to add a main title, subtitle, and axis labels to the plot.

R Programming

plot(1:5, 1:5, main=[1], sub=[2], xlab=[3], ylab=[3])

Drag options to blanks, or click blank then click option'

A"Main Title"

B"Subtitle Text"

C"Axis Label"

D"Extra"

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect argument names.

Forgetting quotes around text.

Using different labels for xlab and ylab when the task wants the same.

The 'main' argument sets the main title, 'sub' sets the subtitle, and 'xlab' and 'ylab' set the axis labels. Axis labels are the same here.

Practice

1. What is the purpose of using main in an R plot?

easy

A. To add a main title to the plot

B. To label the x-axis

C. To label the y-axis

D. To change the plot color

Solution

1. Step 1: Understand the role of main in plotting

   The main argument in R's plot function is used to set the main title of the graph.

2. Step 2: Differentiate from axis labels

   xlab and ylab are used for x-axis and y-axis labels respectively, not main.

3. Final Answer:

   To add a main title to the plot -> Option A

4. Quick Check:

   main = main title [OK]

Hint: Remember: main = title, xlab = x-axis, ylab = y-axis [OK]

Common Mistakes:

• Confusing main with axis labels
• Using main to change colors
• Omitting labels entirely

2. Which of the following is the correct syntax to add a y-axis label "Height" in an R plot?

easy

A. plot(x, y, xlab = "Height")

B. plot(x, y, ylab = "Height")

C. plot(x, y, main = "Height")

D. plot(x, y, label = "Height")

Solution

1. Step 1: Identify the argument for y-axis label

   In R, ylab is used to set the label for the y-axis.

2. Step 2: Check the syntax correctness

   The syntax plot(x, y, ylab = "Height") correctly assigns "Height" as the y-axis label.

3. Final Answer:

   plot(x, y, ylab = "Height") -> Option B

4. Quick Check:

   ylab = y-axis label [OK]

Hint: Use ylab for y-axis label inside plot() [OK]

Common Mistakes:

• Using main instead of ylab for y-axis label
• Using xlab for y-axis label
• Using a non-existent label argument

3. What will be the main title of the plot after running this code?

plot(1:5, 1:5, main = "Sales Over Time", xlab = "Month", ylab = "Sales")

medium

A. Month

B. No title

C. Sales

D. Sales Over Time

Solution

1. Step 1: Identify the main title argument

   The argument main = "Sales Over Time" sets the main title of the plot.

2. Step 2: Confirm other labels are axis labels

   xlab = "Month" and ylab = "Sales" set the x-axis and y-axis labels, not the main title.

3. Final Answer:

   Sales Over Time -> Option D

4. Quick Check:

   main = "Sales Over Time" [OK]

Hint: main sets the plot title, not axis labels [OK]

Common Mistakes:

• Confusing xlab or ylab as main title
• Ignoring the main argument
• Assuming no title if not obvious

4. Identify the error in this R plot code:

plot(x, y, main = "Data", xlabel = "Time", ylab = "Value")

medium

A. The argument 'xlabel' is incorrect; it should be 'xlab'

B. The argument 'main' should be 'title'

C. The argument 'ylab' should be 'ylabel'

D. There is no error in the code

Solution

1. Step 1: Check the axis label arguments

   In R, the correct argument for x-axis label is xlab, not xlabel.

2. Step 2: Verify other arguments

   main is correct for the title, and ylab is correct for y-axis label.

3. Final Answer:

   The argument 'xlabel' is incorrect; it should be 'xlab' -> Option A

4. Quick Check:

   Use xlab, not xlabel [OK]

Hint: Use xlab and ylab, not xlabel or ylabel [OK]

Common Mistakes:

• Using xlabel instead of xlab
• Using ylabel instead of ylab
• Changing main to title incorrectly

5. You want to create a plot with the main title "Temperature Trends", x-axis label "Year", and y-axis label "Temperature (°C)". Which code correctly achieves this?

hard

A. plot(years, temps, main = "Temperature Trends", xlab = "Year")

B. plot(years, temps, title = "Temperature Trends", xlabel = "Year", ylabel = "Temperature (°C)")

C. plot(years, temps, main = "Temperature Trends", xlab = "Year", ylab = "Temperature (°C)")

D. plot(years, temps, main = "Temperature Trends", xlabel = "Year", ylab = "Temperature (°C)")

Solution

1. Step 1: Use correct arguments for labels and title

   The correct arguments are main for the title, xlab for the x-axis label, and ylab for the y-axis label.

2. Step 2: Check each option for correctness

   plot(years, temps, main = "Temperature Trends", xlab = "Year", ylab = "Temperature (°C)") uses all correct arguments. plot(years, temps, title = "Temperature Trends", xlabel = "Year", ylabel = "Temperature (°C)") uses incorrect argument names. plot(years, temps, main = "Temperature Trends", xlabel = "Year", ylab = "Temperature (°C)") uses incorrect xlabel. plot(years, temps, main = "Temperature Trends", xlab = "Year") misses the y-axis label.

3. Final Answer:

   plot(years, temps, main = "Temperature Trends", xlab = "Year", ylab = "Temperature (°C)") -> Option C

4. Quick Check:

   main, xlab, ylab = correct labels [OK]

Hint: Always use main, xlab, ylab for titles and axis labels [OK]

Common Mistakes:

• Using title instead of main
• Using xlabel or ylabel instead of xlab or ylab
• Forgetting one of the labels