Question

matlab中把一个矩阵右旋90度

Answer 1

不知道你所要求的是这种右旋九十度嘛？
如使用矩阵a有如下

a =

1 2 3 4
2 4 6 8
3 6 9 12

>> fliplr(a')

ans =

3 2 1
6 4 2
9 6 3
12 8 4
首先对矩阵a做一个转置，然后调用矩阵左右对调函数即可
恩，好像那个919的回答更专业些，不过好像是左旋，右旋的话可以选用
>> rot90(a,3)

ans =

3 2 1
6 4 2
9 6 3
12 8 4
3表示90的倍数即左旋270

Answer 2

>> help rot90
ROT90 Rotate matrix 90 degrees.
ROT90(A) is the 90 degree counterclockwise rotation of matrix A.
ROT90(A,K) is the K*90 degree rotation of A, K = +-1,+-2,...

Example,
A = [1 2 3 B = rot90(A) = [ 3 6
4 5 6 ] 2 5
1 4 ]

Class support for input A:
float: double, single

See also flipud, fliplr, flipdim.

Answer 3

矩阵转置 A=A'