%Lecture Week 1
%August 27, 2007  Section 001
%August 30, 2007  Section 002 

%Adding two numbers.  See how 1+1 is getting assigned to the variable aa
aa=1+1

%assigning the value of each number and resulting variable
aa=3
bb=7
cc=aa+bb

%Find Stress if force=12 and area=4.5
Force=12
Area=4.5
Stress=Force/Area

%Find sin(pi/4) and cos(pi)
aa= sin(pi/4)
bb=cos(pi)

% How to print a file and how to print the output
% To print a m file, just go File -> Print
% To print the command window, just go to File -> Print

% Find the area of a rectangle of length 12" and height 6.5"
Length=12
Height=6.5
Area=Length*Height

% Supressing an output.  By using a semicolon (;), you are supressing the
% output
Length=12
Height=4.3
Area=Length*Height;

% Compute Area of a Circle
% Diamter=13"
D=23.0
Area_circle=pi*D^2/4

% Plotting graphs.  Draw a graph of sin(x) from -pi to pi.
% See how x is being defined. It is defined as numbers going from -pi to pi
% in increments of 0.1. Smaller the increments, more computer time is used,
% but smoother would be the curve.
  
x = -pi:0.1:pi;
y = sin(x);
plot(x,y)

% How to get help
% type this
% help plot
% in the command window

% Plot 2 exp(x) from x=2.0 to 5.0.
x=2.0:0.1:5.0;
y=2*(exp(x));
plot(x,y)

% Plot data that is given in arrays
x=[1  2  3  5   9]
y=[1  4  9  25    81]
plot(x,y)

% Look at the sample HW problem to see how I would like you to display the
% output for the HW problem
web http://www.eng.usf.edu/~kaw/sample_homework.htm
% Go thru Tutorials
web http://www.mathworks.com/academia/student_center/tutorials/launchpad.html
web http://www.math.duke.edu/education/ccp/materials/diffeq/mlabtutor/contents.html
% the Elusive sprintf command.  What does the \n mean? What does the %d
% mean.
web http://www.mathworks.com/access/helpdesk/help/techdoc/index.html?/access/helpdesk/help/techdoc/ref/sprintf.html

% DO AS MANY PROBLEMS FROM THE BOOK PAGES 1-83