matlab full course

all variables in MATLAB are matrix

>> x = 5
x =
	5

>> size(x) % to know the lenght of the variable
ans =
	1	1

>> v = [1 2 3]
o					% both are valid expression
>> v = [1, 2, 3]

>> size(v)
ans =
	1	3

creating a matrix variable
>> a = [1 2; 3 4]
a =
	1	2
	3	4

>> size(a)
ans =
	2	2
----------------
you know that v = [1 2 3] which size was 1 	3

>> v = v'
v =
	1
	2
	3

>> size(v)
ans =
	3	1
----
access elements of the matrix
example vector -> a = 1		2
					  3		4
>> a(1,1)
ans =
	1

>> a(1,2)
ans =
	2
>> a(2,1)
ans =
	3

-------------
access a vector within a matrix
example vector -> a = 1		2
					  3     4

>> a(1,:)
ans =
	1	2

>> a(:,2)
ans =
	2
	4

>> a(:,:)
ans =
	1	2
	3	4
----------------------
access a range in the matrix
example vector -> x =  1   2   3   4
					   5   6   7   8
					   9  10  11  12
					  13  14  15  16

>> x(2:3,2:3)
ans =
	06	07
    10	11

----------------------
the : syntax can create a range
(create a row vector with the elements 1 to 10)
>> w = 1:10
w =
	1 2 3 4 5 6 7 8 9 10

>> size(w)
ans =
	1	10