%This is an example of how to use Matlab.

%This is a comment

%This is a bunch of simple math statements:
a = 2.    %If you do not put a semi-colon after the statement, the result will 
          %be printed to the screen when you run the program.
b = 3.;   %If you put a semi-colon after the statement, the result will not be 
          %printed to the screen when you run the program.
c = a+b
d = a*pi; %pi is a preset value in matlab, Note that d is not printed out when you run your program
e = cos(a*pi)/b

%When you need help on something in matlab, go to the main matlab menu, 
%and type "help cos" (for instance -- this will get you help on the cosine function)

%Here is a loop that creates a list of even integers from 2 to 200
for i=1:100;  %for loops and  array indices must start with a number greater than zero
   array(i) = i*2; % be sure to put a semicolon here, or a big list will be printed to the screen!
end

%This finds the maximum of the array
array_max = max(array)

%This tells you how large the array is
size(array)

%This plots the array
plot(array) %Figure 1

%This sets up two arrays and plots them against eachother
for i=1:100;
   x(i) = i;
   y(i) = i*i;
end
figure; %open a new figure so you don't overwrite the old one
plot(x,y); %Figure 2

%If statement, greater than or less than:
if (a <= b) c=5;  %(if a is less than or equal to be, set c equal to 5)

%You can also make a polar plot
figure;  polar(x,y);  

%Here is a 2D color plot
for i=1:100;
   for j=1:100;
      array2d(i,j) = i+j;
   end
end
figure; %Figure 3
pcolor(array2d);

%To plot several plots on the same graph:
figure; %open a new figure
plot(array); %Figure 4
hold;  %Hold existing figure
plot(x,y);  %Figure 5   %plot another graph on the same figure
%OR
figure;
plot(x,y,'r');hold;plot(array*2,'b'); %Figure 6
% r = red, b=blue, y=yellow, g=green, k=black
% You can also use different line types and symbols
figure;
plot(x,y,’r.’);plot(array*2,’b-‘);

%Labels and Titles (use help as needed)
title('This is the Title')
xlabel('This is the x-axis')
ylabel('THis is the y-axis')
%gtext('Put something here')  %This uses the cursor to place text on the figure %(uncomment it to try it out)
%legend(‘onething’,’anotherthing’,etc.) creates a legend box for each line in %your plot.  It automatically uses the same line types and colors as are in the %plot.