% Review
1:1:10.^2
(1:1:10).^2

plot([1 4 3 2],[7 3 2 9]);

% what is?
mod(345,23);
floor(345/23);

% Matrices
m1 = [ 1 2 3 ; 4 5 6 ; 7 8 9 ];
m2 = [ 1:1:3 ; 4:1:6 ; 7:1:9 ];

m2 = 1    2    3
     4    5    6
     7    8    9

% Access elements of a matrix (row,column) or (row-range,column-range)
m2(2,3) == 6

m2(:,3) == 3
           6
           9

m2(3,:) == 7    8    9

m2(3,1:2) == 7    8

m2(1:2,1:2) == 1    2
               4    5

% Matrix concatenation
m3 = [[ 1:3 ; 4:6 ; 7:9 ] [ 10:12 ; 13:15 ; 16:18 ]]
   =
     1     2     3    10    11    12
     4     5     6    13    14    15
     7     8     9    16    17    18


% Creation and initialization  (so we can read file data)
m4 = zeros(3,4)
   =
     0     0     0     0
     0     0     0     0
     0     0     0     0

m5 = ones(3,4)
   =
     1     1     1     1
     1     1     1     1
     1     1     1     1