文章出处:

http://evaevazhuxun.blog.sohu.com/154543859.html

http://blog.sina.com.cn/s/blog_a4034b2801012o1n.html

1.roundn

a=123.4567890;
a=roundn(a,-4)

% 返回 123.4568

Round numbers to specified power of 10

2.round

 

函数简介

  调用格式:Y = round(X)

  在matlab中round也是一个四舍五入函数。在matlab的命令窗口中输入doc round或者help round即可获得该函数的相关帮助信息。

  相关函数:ceil、floor、fix

程序示例

  >>a = [-1.9, -0.2, 3.4, 5.6, 7.0, 2.4+3.6i]

  a =

  Columns 1 through 4

  -1.9000 -0.2000 3.4000 5.6000

  Columns 5 through 6

  7.0000 2.4000 + 3.6000i

  >>round(a)

  ans =

  Columns 1 through 4

  -2.0000 0 3.0000 6.0000

  Columns 5 through 6

  7.0000 2.0000 + 4.0000i

  a =

  Columns 1 through 4

  -1.9000 -0.2000 3.4000 5.6000

  Columns 5 through 6

  7.0000 2.4000 + 3.6000i