Octave (1.Basic Operation)

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本文介绍了在Coursera上进行机器学习课程的学习实践，包括安装Octave并使用其进行基本数学运算，变量定义及显示，矩阵和向量操作等。通过实际练习加深对机器学习算法的理解。

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Just study machine learning on Coursera, so we could do some exercise.

Download Octave from Octave
Install the Octave
Use Octave to do some simple calculation

Simple calculation:

1 + 2
2 - 1
3 * 2
5 / 8
2^6
1 == 2     % false = 0
1 ~= 2     % true = 1
1 && 0     % AND
1 || 0      % OR
xor(1,0)    % ans = 1
PS1('>> ')    % just show ">>"

Variable:

a = 3
a = 3;    % semicolon suppress the output
b = 'hi';
b    % output b = hi

a = pi;
a    % output "a = 3.1416"
disp(a)    % output "a = 3.1416"
disp(sprintf('2 decimals: %0.2f', a))    % output "2 decimals: 3.14"

format long
a     % a = 3.14159265358979

format short
a    % a = 3.1416

Matrix and vector:

A = [1 2; 3 4; 5 6]
v = [1; 2; 3]

v = 1:0.1:2
v = 1:6

w = ones(2,3)
w = rand(1,3)
randn(1,10000)    % Guassian
hist(w)    % histogram

I = eye(4)

help eye/rand/help