Matlab/Octave Notes

Operators

1
2
eq, ==
ne, ~=

Matrix index

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
a = [1;2;3];
% index starts from 1, including 2, i.e. [1;2]
a(1:2);

b = [1,3,7;
     2,5,8;
     3,6,9];

% true
b(1) == 1;
b(2) == 2;
b(9) == 9;

% 1 3 7
b(1,:)

% 1
% 2
% 3
% 4
% 5
% 6
% 7
% 8
% 9
b(:)

% unroll
% c = [ 1
%       2
%       3
%       1
%       2
%       3
%       4
%       5
%       6
%       7
%       8
%       9 ]
c = [a(:); b(:)]

b = reshape(c(4:12), 3, 3);

References

Matlab Language Fundamentals
GNU Octave Doc