data types

polyder([4 5 6 7 8 0 ]); 

A = [1 1 1 ; 2 2 2 ; 3 3 3 ] ;
B = [1 1 1 ; 2 2 2 ; 3 3 3 ] ;
D = [1 1 1 1 ; 2 2 2 2 ; 3 3 3 3] ;



% COMMENT 

numel(A);
size(A);
det(A);
inv(A);

x = 3 ; 
y = 4 ; 

x+y ;

A*B;
A.*B;

A(3,2);

C = repmat(A, 3, 4);

C([2, 6], :) ;
C([2, 6], [3, 7]);
C([2:4:end], [3, 7]);

2:3:100;

ans; % calls most recent answer

sqrt(136);
163 / ans;

% multiple asignments 

a = 2; b = 7; c = a * b ;

%  the command     who      tells you all the variables you have used


% the command      whos     tells you more about the varibles (their size, Bytes, Class)


initial_velocity = 0;
acceleration = 9.8;
time = 20;
final_velocity = initial_velocity + acceleration * time;


% the format command 

pi;
x = 7 + 10/3 + 5 ^ 1.22;

format long;   %16 digits after decimal
x = 7 + 10/3 + 5 ^ 1.22;
pi;

format short  % the default format 4 places 
x = 7 + 10/3 + 5 ^ 1.22;
pi;

%The format bank command rounds numbers to two decimal places
format bank
daily_wage = 177.45;
weekly_wage = daily_wage * 6 ;

format short e  % the e in the output is 10
4.678 * 4.9;

% you can also use the format long e 


%The format rat command gives the closest rational expression resulting from a calculation
format rat
4.678 * 4.9;