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How does a matrix differ from a data frame?

• A data frame may contain variables of different lengths.
• A data frame may contain variables that have different modes.
• A matrix must not be singular.
• A matrix may contain numeric values only.

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What value does this statement return?

unclass(as.Date("1971-01-01"))

• 4
• 1
• 365
• 12

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What do you use to take an object such as a data frame out of the workspace?

• delete()
• erase()
• detach()
• remove()

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Review the following code. What is the result of line 3?

1  xvect<-c(1,2,3)

2 xvect[2] <- "2"

3 xvect

• [1] 7 9
• [1] "1" 2 "3"
• [1] "1" "2" "3"
• [1] 1 2 3

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The variable "height" is a numeric vector in the code below. Which statement returns the value 35?

height<-c(25,18,40,45,35)

• height[length[height]]
• height(5)
• height(length(height))
•  height[length(height)]

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