MATLAB – What Is It ?

Name is from matrix laboratory Powerful tool for

– Computation and visualization of engineering and science mathematics

– Communication of ideas– Programming:

Built-in editor, debugger, and help Many predefined functions (grouped in toolboxes) Interpreted or compiled programs

MATLAB – Where Is It ?

MATLAB is available on all computers in the Engineering Computer Center and on many other computers located in departments within the College of Engineering (Computer Classroom 225 Wales). You can also purchase your own Student Version from MathWorks at: http://www.mathworks.com/academia/student_version/?BB=1

How Do We Want To Use MATLAB

In Dynamics Course?

Write a Simple MATLAB Program to Do the Following:

- Calculate Velocities of Sample Problem 15.3

- Make Plots of vD and ωBD vs θ in Two Different Windows

- Mark Graphs to Indicate Text Solution Values and where ωBD = 0.

Creating Your Own ProgramScript (m-file) Concept

M-file is a collection of MATLAB commands – Can be re-executed – Is easily changed/modified or e-mailed to someone

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

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

Demo MATLAB CodeCalculate & Plot Equation: y=2x+30x2-2x3

Dot needed for element-by-element operation

Plotting Line Specifiers

Line Specifiers Change the LookEspecially Handy When Plotting Several Lines on Same GraphUse Help Menu to Find Out More

0 20 40 60 80 100 120 140 160 1800

100

200

300

400

500

600

700

Crank Angle, (Radians)

Vel

ocity

of

Poi

nt D

(in

/s)

Velocity of Point D vs SAMPLE PROBLEM 15.3 Prof Sadd

The Project Problem

Labels & Titles

Use text to write to screen; text(x,y,’. . . ’)

Mark Text Solution

θ

vD = ?ωBD = ?

Text Solution

Good Luck!