octave基本指令5

控制语句

for

>> v=zreos(5,1)

v =

    0

    0

    0

    0

    0

>> for i=1:10,

>    v(i) = 2^i;

>  end;

>> v

v=

    2

    4

    8

   16

   32

>> indices = 1:5;

>> for i = indices,

>    disp(i);

>  end;

1

2

3

4

5

while

>> i = 1

>> while i<=5,

>    v(i) = 100;

>    i = i + 1;

>  end;

>> v

v =

    100

    100

    100

    100

    100

>> i = 1;

>> while true,

>    v(i) = 999;

>    i = i + 1;

>    if i == 6,

>      break;

>    end;

>  end;

>> v

v =

    999

    999

    999

    999

    999

if

>> v(1)

ans = 999

>> v(1) = 2;

>> if v(1) == 1;

>    disp('The value is one');

>  elseif v(1) = 2,

>    disp('The value is two');

>  else

>    disp('The value is not one or two');

>  end;

the value is two

定义函数

在 Octave 环境下定义的函数 你需要创建一个文件 用你的函数名来命名 然后以 .m 的后缀结尾

• squareThisNumber.m
  
  function y = squareThisNumber(x)
  
  y = x^2;

• 如果键入SquareThisNumber(5) 返回值是25

• 使用 addpath 命令添加路径 添加路径
  
  addpath('C:\Users\ang\desktop')

• 返回多个函数值
  
  function [y1, y2] = squareAndCubeThisNumber(x)
  
  y1 = x^2;
  
  y2 = x^3;