功能: 矩阵顺时针旋转90度

格式: Rotate90(a)

a : 为输入的矩阵变量

说明: 本函数执行完毕, 返回一个a逆时针旋转90度后的矩阵变量。注意本函数和函数{AntiRotate90<矩阵运算\AntiRotate90>}、{FilpLeftRight<矩阵运算\FilpLeftRight>}、{FilpUpDown<矩阵运算\FilpUpDown>}、{Transpose<矩阵运算\Transpose>}的区别。

例子: 
a =
[ 1.00000000000000    2.00000000000000    3.00000000000000    4.00000000000000
  5.00000000000000    6.00000000000000    7.00000000000000    8.00000000000000
  9.00000000000000    10.0000000000000    11.0000000000000    12.0000000000000 ]
b = Rotate90(a)//执行得到如下结果
b =
[ 9.00000000000000    5.00000000000000    1.00000000000000
  10.0000000000000    6.00000000000000    2.00000000000000
  11.0000000000000    7.00000000000000    3.00000000000000
  12.0000000000000    8.00000000000000    4.00000000000000 ]