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Section 9.3 Test your knowledge
Checkpoint 9.3.1.
According to the chapter, what is the primary purpose of writing a "function" in R?
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To create a block of code that can be used over and over again without retyping it.
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Right! A function is a reusable piece of code designed to perform a specific task.
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To automatically find and install packages that solve a problem.
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No, packages contain functions, but the purpose of a function itself is reusability, not installation.
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To define the statistical mode for a set of numbers.
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No, this was the specific goal of the example function `MyMode`, but the general purpose of any function is to be a reusable block of code.
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To pass an argument from one part of a program to another.
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No, passing an argument is how you provide input *to* a function, but it’s not the primary purpose *of* the function.
Checkpoint 9.3.2.
When creating a function in R with the line
MyMode <- function(myVector), what is the role of
myVector?
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It is an "argument" that serves as a placeholder for the input data the function will use.
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Correct! The text identifies this as the argument, or input, to the function.
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It is the "return" value that the function sends back when it is finished.
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No, the `return()` statement specifies the output. The argument is the input.
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It is the name of the new function being created.
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No, in this example, the name of the function is `MyMode`.
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It is a new variable that is created in the R environment automatically.
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No, it is a placeholder that only has meaning inside the function when the function is run.
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