## 1. What is an array in R?

### Answer:

### Explanation:

An array in R is a multi-dimensional data structure that can store data in more than two dimensions.

## 2. How do you create a 2×3 array of zeros in R?

### Answer:

### Explanation:

Both array(0, dim = c(2, 3)) and matrix(0, 2, 3) create a 2×3 array (or matrix) filled with zeros.

## 3. What is the result of applying the dim() function to an array in R?

### Answer:

### Explanation:

The dim() function returns the dimensions of an array, such as the number of rows and columns in a 2-dimensional array.

## 4. How can you access the element in the 2nd row and 3rd column of a 2-dimensional array 'arr' in R?

### Answer:

### Explanation:

Elements in an array are accessed using the [row, column] indexing in R.

## 5. How do you create a 3-dimensional array in R?

### Answer:

### Explanation:

A 3-dimensional array in R is created using the array() function with the 'dim' parameter specifying the dimensions.

## 6. What does the apply() function do with an array in R?

### Answer:

### Explanation:

The apply() function applies a function to the margins of an array or matrix.

## 7. How do you combine two arrays of the same dimension in R?

### Answer:

### Explanation:

The c() function can be used to combine two or more arrays of the same dimension into a single array in R.

## 8. Which function can be used to transpose a 2-dimensional array in R?

### Answer:

### Explanation:

The t() function is used to transpose a 2-dimensional array or matrix in R.

## 9. How do you initialize an array with specific dimensions but without data in R?

### Answer:

### Explanation:

The array() function can be used to create an array with specific dimensions but without initializing the data.

## 10. What is the use of the aperm() function with an array in R?

### Answer:

### Explanation:

The aperm() function is used to permute or rearrange the dimensions of an array.

## 11. Can you store different data types in a single array in R?

### Answer:

### Explanation:

Arrays in R are homogeneous and can only store elements of the same data type.

## 12. How do you create a 2x2x2 array filled with random numbers in R?

### Answer:

### Explanation:

The array() function combined with runif(8) (which generates 8 random numbers) can be used to create a 2x2x2 array filled with random numbers.

## 13. What does the expression arr[,,1] represent for a 3-dimensional array 'arr' in R?

### Answer:

### Explanation:

In a 3-dimensional array, arr[,,1] represents the first matrix slice along the third dimension.

## 14. How do you determine if an object is an array in R?

### Answer:

### Explanation:

The is.array() function is used to check if an object is an array in R.

## 15. How do you create an array from a vector in R?

### Answer:

### Explanation:

To create an array from a vector, use the array() function and specify the vector and the desired dimensions.