﻿功能:余弦函数

格式:cos(a)

说明:a可以为矩阵(此时对矩阵里的每个元素求余弦),也可以为数字(此时对本数字求余弦)

例子:

x =
 [ 69.4186357638885  92.1004041992595  26.8114049112477
   85.6649515617941  85.2955676081104  78.6668200412145
   83.8496410212711  12.9909401819999  40.1312348154053 ]

c=cos(x)//回车得到如下结果
c =
 [ 0.954267209902394  -0.545159265264009  -0.10765829802636
  -0.666009567166673  -0.890403265729513  -0.991945864703327
  -0.562524212100742   0.911216124760424  -0.758707448997077 ]