How would you write a syntax to calculate the mean of a numeric vector in R?
- mean(vector)
- median(vector)
- mode(vector)
- sum(vector)
The mean of a numeric vector in R can be calculated using the 'mean()' function. You simply pass the vector as an argument to the function, like so: 'mean(vector)'.
Suppose you're given a factor in R and asked to calculate its mode. How would you do this?
- Convert the factor to a character vector and calculate the mode
- Apply the mode() function directly on the factor
- Use the levels() function to identify the most frequent level
- Convert the factor to a numeric vector and calculate the mode
To calculate the mode of a factor in R, you would use the levels() function to identify the most frequent level among the distinct levels present in the factor.
In R, the ______ function can be used to check if an object is a list.
- is.list()
- is.vector()
- is.data.frame()
- is.matrix()
In R, the is.list() function can be used to check if an object is a list. It returns TRUE if the object is a list and FALSE otherwise. This function is useful for verifying the type of an object before applying operations specific to lists.
Suppose you have a character variable that contains a number, and you want to convert it to a numeric variable. How would you do that?
- Use as.character() function
- Use as.numeric() function
- Use toNumeric() function
- Use toString() function
To convert a character variable that contains a number to a numeric variable in R, we use the as.numeric() function. For example, as.numeric("123") would return 123.
How does the collapse argument work in the paste() function in R?
- It collapses all spaces in the output vector
- It collapses the output vector into a single string with a specified separator
- It doesn't exist
- None of the above
The 'collapse' argument in the paste() function in R collapses the output vector into a single string with a specified separator. For example, 'paste(c("Hello", "world!"), collapse = " ")' would return "Hello world!".
Suppose you're asked to optimize a piece of R code that performs complex calculations on large matrices. What are some strategies you could use to improve its performance?
- Use vectorized operations and functions
- Utilize parallel processing or distributed computing
- Reduce memory usage through efficient data structures
- All of the above
Some strategies to improve the performance of R code operating on large matrices include using vectorized operations and functions, utilizing parallel processing or distributed computing frameworks, reducing memory usage through efficient data structures or sparse matrix representations, and optimizing the algorithmic complexity of the calculations. These strategies can help leverage the computational power of modern hardware and enhance the efficiency of matrix operations.
How do you create a vector in R?
- Using the c() function to combine elements into a vector
- Using the vector() function to initialize an empty vector
- Using the list() function to create a vector
- All of the above
In R, a vector can be created by using the c() function, which stands for "combine." You can pass multiple elements separated by commas or use the c() function to combine existing vectors into a new vector. The c() function is a versatile way to create vectors of different lengths and types.
What function is commonly used to calculate the mean in R?
- mean()
- median()
- sum()
- mode()
The mean() function is commonly used to calculate the mean in R. The mean() function calculates the arithmetic average of a numeric vector.
An else statement in R can only be used after an ________ statement.
- if
- for
- while
- repeat
An else statement in R can only be used after an if statement. It provides an alternative code block to execute when the condition of the if statement is false. The else statement is optional and allows for branching based on the outcome of the if condition.
In R, to match a literal period in a regular expression, you would use the escape sequence ________.
- .
- *
- /
- ?
In R, to match a literal period (dot) in a regular expression, you would use the escape sequence . . For example, "abc.def" would match the string "abc.def".