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1.
Which of the following functions is used to create data frames?
2.
What is the purpose of the plot() function in R?
3.
What is the output of the following R code:
X1 < -c(6, 2, 4, 1)
X2 < -c(2, 3)
X1 * X2
X2 < -c(2, 3)
X1 * X2
4.
What is the output of the following R code:
X1 < -1: 6
X2 < -2: 4
X1 + X2
X2 < -2: 4
X1 + X2
5.
In R, which of the following statements is true?
6.
Which of the following statements is false in R?
7.
In R, which of the following statements about the subscripting is correct:
- The dimensions of arrays and data frames are subscripted independently.
- The subscripting matrix has as many rows as there are dimensions in the array.
- Lists are not subscripted just like other vectors.
- Arrays can be subscripted with a matrix of positive numbers.
8.
In R, which of the following statements about the na.rm argument is correct?
9.
In R, which of the following statements about the grid and *lattice packages is correct:
- Grid is a new graphical mode with the inherited system of graphical parameters
- Grid graphics cannot usually be combined or mixed with base graphics
- The main idea behind lattice is that of unconditional multiple graphs
- Lattice is essentially the implementation in R of the Trellis graphics of S-PLUS.
10.
In R, which of the following functions is used to changes a number from storage mode integer to storage mode double?