基本运算
octave:3> 5+6 ans = 11 octave:4> 3-2 ans = 1 octave:5> 8*9 ans = 72 octave:6> 8/4 ans = 2 octave:7> 6/4 ans = 1.5000 octave:8> 2^6 ans = 64 octave:9>
注释：% 表示注释符号
octave:9> 1 == 2 %false ans = 0 octave:10> 1~=2 ans = 1 octave:11> 1 && 0 % AND ans = 0 octave:12> 1 || 0 % OR ans = 1 octave:13> xor(1,0) % 异或 ans = 1 octave:14>
改变提示符： octave:14> PS1('>> '); ，' ' 内表示所选提示符
>> a=3
a = 3
>> a=3;%加上分号将不会显示
>> a
a = 3
>> a=3;
>> a=2
a = 2
>> a=2;%加上分号将不会显示
>> b='hi'
b = hi
>> c=(3>=1)
c = 1
>> a=pi
a = 3.1416
>> disp(a)
3.1416
>> disp(sprintf('2 decimals: %0.2f',a)) % 类似于C语言的输出语句
decimals: 3.14
矩阵和向量：
>> A = [1 2; 3 4; 5 6]
A =
2
4
6
>> A=[1 2;
4;
6]
A =
2
4
6
>> V=[1 2 3]
V =
2 3
>> V=[1;2;3]
V =
2
>> V=1:0.1:2
V =
Columns 1 through 7:
1.0000 1.1000 1.2000 1.3000 1.4000 1.5000 1.6000
Columns 8 through 11:
1.7000 1.8000 1.9000 2.0000
>> V=1:6
V =
2 3 4 5 6
>> ones(2,3)
ans =
1 1
1 1
>> 2*ones(2,3)
ans =
2 2
2 2
>> C=[2 2 2;2 2 2]
C =
2 2
2 2
>> w=ones(1,3)
w =
1 1
>> w=zeros(1,3)
w =
0 0
>> w=rand(1,3)
w =
0.76244 0.97843 0.82005
>> w=rand(3,3) %产生随机数矩阵，范围0~1
w =
0.844846 0.070033 0.276175
0.330128 0.777480 0.369802
0.015571 0.482700 0.163547
>> w = randn(1,3) %产生服从高斯分量的随机矩阵
w =
0.63218 0.16167 -0.34970
>>
绘制直方图：
>> w=-6 + sqrt(10)*(randn(1,10000)); >> hist(w)
绘制更多竖条的直方图（50个）：
>> hist(w,50)
单位矩阵：
>> i=eye(4) i = Diagonal Matrix 0 0 0 1 0 0 0 1 0 0 0 1
可输入help命令获得帮助，如：
help eye
help rand