Vector Operations and Functions in R

The video tutorial covers the practical aspects of handling vectors in R. It begins with an introduction to vectors, explaining how to define them and check their class. The tutorial then explores various vector operations, including combining vectors and performing arithmetic operations. It introduces the recycling rule, which applies when vectors of different lengths are involved in arithmetic operations. Finally, the video explains vector indexing techniques, such as retrieving specific elements and using range indexing.

What function is used to define a vector in R?

• vector()

• c()

• array()

• list()

What happens when a numeric and a character value are combined in a vector?

• The vector becomes a list

• The vector becomes character

• The vector becomes logical

• The vector becomes numeric

What is the class of a vector containing both numbers and characters?

• Numeric

• Logical

• Character

• Factor

What function is used to check the length of a vector in R?

• dim()

• count()

• length()

• size()

What is the result of adding two vectors of the same length?

• The vectors are subtracted element-wise

• The vectors are added element-wise

• The vectors are multiplied

• The vectors are concatenated

What is the warning message when adding vectors of different lengths?

• Longer object length is not a multiple of shorter object length

• Vectors are multiplied

• Vectors cannot be added

• Vectors are concatenated

What is the recycling rule in vector arithmetic?

• Elements of the longer vector are added with the first element of the shorter vector

• Shorter vector is ignored

• Longer vector is ignored

• Elements of the shorter vector are added with the first element of the longer vector

How do you retrieve the 5th element of a vector in R?

• v(5)

• v[5]

• v{5}

• v<5>

What does negative indexing in R do?

• Retrieves the element at the negative index

• Excludes the element at the specified index

• Adds the element at the specified index

• Multiplies the element at the specified index

How can you retrieve non-continuous elements from a vector?

• Using a list

• Using a matrix

• Using another vector for indexing

• Using a loop