Which one is written to generate a 4 × 4 identity matrix. ( )
A: ones(4)
B: eye(4)
C: zeros(4)
D: rand(4)
A: ones(4)
B: eye(4)
C: zeros(4)
D: rand(4)
举一反三
- 下面哪一个命令可以生成4阶单位阵 A: one (4) B: ones (4) C: eye (4) D: eyes (4)
- 【多选题】执行下列哪些选项中的语句后能得到如下矩阵? 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 A. > matrix(c(1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4), nrow=4, ncol=5) B. > matrix(rep(1:4, 5), nrow=4) C. > matrix(rep(1:4, each=5), nrow=4, byrow=TRUE) D. > matrix(1:4, nrow=4, ncol=5)
- 下列创建3*4的全0数组的语句是( ) A: ones(3,4) B: zeros(4,3) C: zeros(3,4) D: ones(4,3)
- 4. Which one is for Question 4?
- 以下关于二维数组的写法,正确的是: A: char message[4][100]; B: double matrix[4][4*4]; C: int chess[8][8]; D: const int N = 4; flags[10][N*2];