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R Programmingprogramming~5 mins

Labels and titles in R Programming - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What function in R is used to add a main title to a plot?
The title() function is used to add a main title to a plot in R.
Click to reveal answer
beginner
How do you add labels to the x-axis and y-axis in an R plot?
You can add labels to the x-axis and y-axis using the xlab and ylab arguments inside the plot() function or by using the title() function with xlab and ylab arguments.
Click to reveal answer
beginner
What argument inside the plot() function controls the main title?
The main argument inside plot() controls the main title of the plot.
Click to reveal answer
intermediate
How can you add a subtitle to a plot in R?
You can add a subtitle using the sub argument inside the plot() function or by calling title(sub = "Your subtitle") after the plot.
Click to reveal answer
beginner
What is the difference between main and sub in R plotting?
main sets the main title at the top of the plot, while sub sets a subtitle below the plot.
Click to reveal answer
Which argument adds a main title directly inside the plot() function?
Amain
Btitle
Clabel
Dcaption
How do you add a label to the x-axis in a plot?
AUse <code>xlab</code> argument
BUse <code>ylab</code> argument
CUse <code>main</code> argument
DUse <code>sub</code> argument
Which function can add a title after a plot is created?
Alabel()
Bplot()
Ctitle()
Daxis()
What does the sub argument do in R plotting?
AAdds a main title
BAdds a subtitle below the plot
CLabels the y-axis
DLabels the x-axis
If you want to label the y-axis, which argument do you use?
Asub
Bxlab
Cmain
Dylab
Explain how to add a main title, x-axis label, and y-axis label to a plot in R.
Think about the arguments inside the plot() function.
You got /4 concepts.
    Describe the difference between the 'main' and 'sub' arguments in R plotting.
    Consider where the text appears on the plot.
    You got /3 concepts.

      Practice

      (1/5)
      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
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