﻿功能:求双曲正割值

格式:Sech(z)

说明:求z的双曲正割值,按定义Sech(z)=1/{Cosh<矩阵运算\Cosh>}(z).z可以为矩阵(此时对矩阵里的每个元素求双曲正割),也可以为数字(此时对本数字求双曲正割)

例子:

b =
[ 0.434994564128571     0.648561094723903     0.992225544989214
  0.669613770986727     0.689008104470096     0.636164162604215
  0.871843400817291     0.290583205544661     0.928670651711836
  0.403033647873920     0.158982726353678     0.533521447113492 ]

a=Sech(b)//回车执行命令后得到如下的值
a =
[ 0.912316009928397     0.821158285911381     0.651894465262245
  0.811231027645013     0.801984821614563     0.826945476713996
  0.711871729296582     0.959216773897765     0.683475439880604
  0.923938238568338     0.987493986217721     0.872805439734817 ]