%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% MATLAB INTRO TUTORIAL
% BY CNSO
% SEPT 23, 2009
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% I suggest copying examples line-by-line into the command window and
% running them from there - that way you can see the results of each
% command separately

% Most importantly, play with all the examples: run them and look at the
% results, change something, run them again and see what happens!

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% VARIABLES

% numeric variable
a=12.7
variables_names_can_be_weird=0.345
% compare to
a=12.7; % output is suppressed

% text (character,string) variable
st='This is simple!'

% logical (boolean) variable
bl=true
bl=(a==3)
bl=(a>=5)

% numeric array
b=[1,2,3]
% compare to
b=[1 2 3]
c=[4;5;6]
d=[1,2,3,4;5,6,7,8;9,10,11,12;13,14,15,16]
e=[1:5;1:2:9]

% access to array elements
d
d(3,4)
d(1:4,2)
% compare to
d(1:end,2)
% and to
d(:,2)

% advanced example
e(1:2,1:2)=d([1,3],[2,4])
[d(:,3),d;d(2,:),d(end,end)]

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% MATH OPERATIONS

b'
3*b
b+c'
b*c
c*b
b.*c'

% advanced example
f=(d(1:3,1:3)+c*b)/10

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% FUNCTIONS

sqrt(a)
sum(d)
sum(d,2)
zeros(5,5)
3*ones(3,4)

% advanced example
g=find(abs(d-8*ones(4,4))>6)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% FLOW CONTROL TOOLS

% 'if' - executing commands if condition is true
h=5;
if (h>3)
    disp('true');
else
    disp('false');
end

% 'for' - executing commands fixed number of times
for i=1:10
    disp('new iteration');
    i
end

% 'while' - repeatedly executing commands while the condition is true
j=7;
while (j>0)
    disp('new iteration');
    j
    j=j-1;
end

% advanced example
k=zeros(5,5);
for i=1:5
    for j=1:5
        k(i,j)=3;
    end
end
% often there is a way to avoid loops and it is almost always faster
k=3*ones(5,5);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% PLOTTING

x=0:0.05:2*pi;
y=sin(x);
plot(x,y);

% advanced example
figure;
plot(x,y,x,(x-pi)/2,'LineWidth',3);
xlim([0,2*pi]);
xlabel('x axis');
ylabel('y axis');
legend('sinusoid','straight line');
grid('on');
title('title');

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% SAVING AND LOADING DATA

save('my_data.mat','a','b','c','d');
clear('all')
load('my_data.mat');

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% GETTING HELP

help sqrt
help find

% use MATLAB "Product help" via the upper menu in the MATLAB main window
% (shortkey F1) to do the "Getting Started" tutorial, play with "Demos", or
% search for functions you need

% for example, search for "using the plot catalog" - a useful tool to get
% you started with different visualization tools

% you can always google specific MATLAB questions - there are a lot of
% specialized forums on the internet

% HAVE FUN WITH MATLAB!