How do you slice arrays in R language?

In R language, you can use square brackets [] to slice arrays. Here are some examples:

1. Slice the vector.

# 创建一个向量
vec <- c(1, 2, 3, 4, 5)

# 切片操作，提取第2到第4个元素
sub_vec <- vec[2:4]
print(sub_vec)

1. Slice the matrix.

# 创建一个3x3的矩阵
mat <- matrix(1:9, nrow=3)

# 切片操作，提取第1行和第2列的元素
sub_mat <- mat[1, 2]
print(sub_mat)

1. Perform slicing operation on an array.

# 创建一个3x3x3的数组
arr <- array(1:27, dim=c(3,3,3))

# 切片操作，提取第1个元素的值
sub_arr <- arr[1,1,1]
print(sub_arr)

By using square brackets [] for slicing operations, specific elements or subsets can be easily extracted from an array.