How would you extract a substring from a string in R?
- Use the extract() function
- Use the slice() function
- Use the sub() function
- Use the substring() function
The substring() function in R is used to extract a substring from a string. For example, substring("Hello", 2, 3) would return "el".
Which R function returns the absolute value of a number?
- abs()
- absolute()
- fabs()
- modulus()
The abs() function in R is used to return the absolute value of a number. For example, abs(-5) would return 5.
What is the common use case for nested loops in R?
- Iterating over multiple dimensions of an array
- Filtering and transforming data in a nested structure
- Simulating complex processes
- All of the above
The common use case for nested loops in R is when you need to perform operations that involve iterating over multiple dimensions of an array, filtering and transforming data in a nested structure (such as a list of lists), or simulating complex processes that require nested iterations.
How do you represent a newline character in R?
- n
- r
- t
- b
In R, a newline character is represented using the escape sequence n. For example, "HellonWorld" would result in two lines: "Hello" and "World".
The ________ function in R is used to convert a variable to numeric.
- as.character()
- as.factor()
- as.logical()
- as.numeric()
The as.numeric() function in R is used to convert a variable to numeric. It is important to ensure that the variable is indeed convertible to numeric, otherwise NA's might be introduced.
The ______ function in R can be used to find the maximum value in each row of a matrix.
- apply()
- max.row()
- rowMax()
- max()
The rowMax() function in R can be used to find the maximum value in each row of a matrix. The rowMax() function returns a vector of maximum values corresponding to each row of the matrix.
To customize the axis labels in an R bar chart, you would use the ______ parameter.
- col
- names.arg
- horiz
- labels
To customize the axis labels in an R bar chart, you would use the names.arg parameter. By providing a vector of labels corresponding to each bar, you can specify custom labels for the bars on the axis.
In R, a vector is created using the ______ function.
- c()
- vector()
- list()
- array()
In R, a vector is created using the c() function, which stands for "combine." The c() function allows you to combine elements into a vector by separating them with commas. You can also use the c() function to combine existing vectors into a new vector.
What function is commonly used to create a basic pie chart in R?
- pie()
- barplot()
- plot()
- scatterplot()
The pie() function is commonly used to create a basic pie chart in R. It takes a vector of non-negative numeric values as input and creates a pie chart where each segment represents a proportion of the whole.
How would you implement a Jumbotron inside a Container while ensuring proper alignment and spacing?
- Nest a jumbotron inside a container class in HTML and adjust styles accordingly.
- Use flexbox properties for the container and apply Bootstrap's jumbotron class.
- Apply custom CSS for both the container and Jumbotron to ensure alignment.
- Embed a container inside a jumbotron and use inline styles.
To achieve proper alignment and spacing, nest a Bootstrap jumbotron inside a container class. This leverages the built-in styles and responsiveness of Bootstrap, providing a clean and consistent layout. Other options may lead to issues with alignment or require more manual styling.