1. MCE 372 Engineering Analysis
MATLAB Review

2. MATLAB – What Is It ? Where Is It?
Name is from matrix laboratory
Powerful tool for
Computation and visualization of engineering, science and mathematics
Communication of ideas
Programming:
Built-in editor, debugger, and help
Many predefined functions (grouped in toolboxes)
Interpreted or compiled programs
Located on all ECC PC’s & in many department facilities

3. How Do We Want To Use MATLAB In This Course?
Write Simple MATLAB Programs to Do the Following:
- Perform Particular Calculations
Display/Plot Results for Interpretation

4. Creating Your Own Program Script (m-file) Concept
M-file is a collection of MATLAB commands
Can be re-executed
Is easily changed/modified, transferred or ed
File format: Name.m
Commands are executed one by one sequentially
File is executed by typing its name (without .m)
Results appear in the command window (or use ; )
Can be created using any text editor, but is most easily developed in MATLAB Editor Window

5. Boot Up Default MATLAB Window
Help menu provides answers to most questions
Opens Editor Window to create new program
In this window: - type & edit commands - test & run program - save work when finished

6. Demo MATLAB Code Calculate & Plot Equation: y=2x+30x2-2x3
Dot needed for element-by-element operation
Semicolon used to suppress output to Command Window – commonly desired

7. Plotting Line Specifiers
Line Specifiers Change the Look Especially Handy When Plotting Several Lines on Same Graph Use Help Menu to Find Out More

8. Example Code % MCE 372 Demo Program
% Make Multiple Plots on Same Axes with Legends
clc;clear all;clf
x=0:0.1:10;
y1=2*x+30*x.^2;
y2=10*x.^3;
y3=200*x
% Plot all functions on same axes
plot(x,y1,'k','linewidth',2)
hold on;grid on
plot(x,y2,'b','linewidth',2)
plot(x,y3,'r','linewidth',2)
xlabel('x');ylabel('y')
title('MCE 372 Demo Plot')
legend('y1','y2','y3')