Knowledge Quiz: Functions

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Which of the following options represent R function calls?

NA"foo"mean(x, trim = 0.1, na.rm = TRUE)bar.libPaths()TRUE

You can recognize a valid function call by the pattern: FUNCTION_NAME().

• This is R’s missing value code.
• This is a length-one character vector.
• Correct. This function call would calculate the trimmed mean of x, ignoring any missing values.
• This is a symbol (i.e., the name of an object).
• Correct. This function call will list the library paths where R will install packages on your system.
• This is a length-one logical vector.