R Programming Langauge Practice Quiz: R Quiz 2

1. What is the primary use of the repeat loop in R?

• To skip iterations based on a condition
• To switch between different loop constructs
• To create an infinite loop
• To perform a specified number of iterations

2. Which of the following functions can be used to find positions of values in vector1 that are the same as in vector2?

• test()
• partner()
• match()
• equal()

3. How do you access an individual element within an R matrix by specifying its row and column?

• Using the $D operator
• Using the [row, col] notation
• Using the element() function
• Using the access() function

4. When creating a factor in R, what is the default order of levels if not specified?

• Numerical order
• Order of appearance in the data
• Random order
• Alphabetical order

5. You want to combine two vectors into a single vector in R. Which function should you use for this purpose?

• c()
• merge()
• combine()
• join()

6. In R, which function is used to repeat a block of code until a specified condition is met?

• switch()
• ifelse()
• for loop
• break()

7. What function in R can you use to save a plot as an image file, such as a PNG or JPEG?

• ggsave()
• save_plot()
• export()
• download_plot()

8. Which function can be used to transpose a matrix in R?

• switch()
• flip()
• t()
• transpose()

9. What is the purpose of the droplevels() function in R?

• To change the data type of a factor
• To reorder the levels of a factor
• To remove unused levels from a factor
• To convert a factor to a character vector

10. In R, which data type is used to store text and character data?

• Integer
• Individual
• String
• Character