Knowledge Quiz: Vectors

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Which of the following expressions generates the integer vector 1, 2, 3, 4, 5?

rep(1:5, 1)seq(1, 5, 5)seq(1, 5)seq(0, 4, 1) + 11:5

• Correct.
• Wrong. This command will return a length-one vector containing only 1.
• Correct.
• Correct.
• Correct.

What is the value of a * b, given the following vectors?

\[ \begin{align*} a &= 5, 2, 1\\ b &= 1, 2, 3 \end{align*} \]

• Format you answer as element1, element2, element3, ...
• Separate each element with a comma and a space.
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The a * b implements element-wise multiplication, so the result is 5, 4, 3.