MATLAB is a programming language for technical computing and data analysis. It allows users to perform arithmetic operations, use mathematical functions, manipulate data, create plots and graphs, write programs using conditional statements and loops. The document provides an overview of MATLAB's interface and important terms, and demonstrates how to perform common tasks like creating arrays and matrices, plotting data, writing for and while loops, and defining functions. MATLAB is relevant for tasks in many engineering fields like signal processing, optimization, finite element analysis, and statistical analysis.

1. Introduction: MATLAB
Kenya Alfaro
Jairo Maldonado

2. Overview
› Introduction - What is MATLAB?
› How Does It Look?
› Important MATLAB Terms
› Getting the MATLAB Software
› Arithmetic Operations and Mathematical
Functions
› Conditions
› Creating Arrays Matrices
› Array Operators
› Data Manipulation
› Math Function
› Plotting
› If-elseif-else statements
› FOR Loops
› WHILE Loops
› Functions
› Relevance
› Problem

3. Introduction - What is MATLAB?
MATLAB is a high-performance language for
technical computing (A very big calculator).
Data Analysis Serial
Communication
Calculations

4. Command Window:
Single-line code execution
Editor’s Window:
Edit scripts/functionsWorkspace
Window:
Saved variables
Editor Tab: Edit scripts and functions
Run: Execute scripts
New: Create
scripts/functions

5. Getting the MATLAB Software
1. Google: CSULB Software Depot
2. Login to the Depot
3. Search: matlab
4. Add to Cart
5. Check out

6. Arithmetic Operations and Mathematical
Functions
Symbols Description
+ Add expression
- Negative of an expression
* Multiply expression
/ Divide expression
^ Raising an expression to a power

7. Conditions
● Is the condition true?
● True = 1 ● False = 0
Equal To Greater
Than
Less Than Great Than
Or Equal To
Not Equal
To
== > < >= ~=
Example:
1. 5 == (225/45)
2. 2^3 > (2+7)
3. (11*9) < (108-5)

8. Creating Arrays
● 3 ways to create an array in row
○ [ _ _ _ ];
○ Start : Increment : End;
○ Linspace(Start, End, Amount of Points);
● Convert to Column
○ [ _ _ _]’;
○ transpose(array);

9. Matrices
● Semicolon creates a new row
● A = [ _ _ _ ; _ _ _ ; _ _ _];
● Ex:
B =
1 2 3
0 5 0
7 0 9
● Join matrices
○ [ B A] horizontally
○ [ B;A] vertically

10. Array Operators
Symbols Description
+ Add expression
- Negative of an expression
* or .* Multiply expression
/ or ./ Divide expression
^ or .^ Raising an expression to a
power
● Period creates element by element arithmetic

11. Data Manipulation
● Find data in a matrix using rows and columns
○ data = variable(row, column)
● Use find( ) to manipulate data in an array or matrix
○ [row,column] = find(data, indices returned)
○ [row,column] = find(use conditional statement)
● Use both
Ex:
1. [r,c] = find(B)
2. B(2,3)
3. B(find(B))

12. Math Functions
● mod(a,m)
● min(B)
● max(B)
● isempty(B)
● abs(x)
● exp(x)
● log10(x)
● sqrt(x)
● sin(x)
● sind(x)
● rand(x)
● zeros(row,col)
● ones(row,col)
● eye(row,col)

13. Plotting
plot(x,y,LineSpec)
● x=data to be plotted on x-axis
● y=data to be plotted on y-axis (must be same
length as x)
● LineSpec=specify line/point color, shape, pattern
or thickness
xlabel/ylabel(‘LabelName’)
● LabelName will be displayed on respective axis
title(‘TitleName’)
● TitleName will be displayed on top of graph
hold on/hold off
● helps plot multiple plots in the same figure
legend(‘Name1,Name2’)
● Creates a legend for line(s)

14. Day Temperature
(F)
X Y
1 86
2 88
3 90
4 86
5 81
6 80
7 79
Ex. Plotting Weekly
Temperature Data

15. Ex. Plotting Weekly
Temperature Data of LA and
SF
Day Temperature (F)
Los Angeles
Temperature (F)
San Fransisco
1 86 60
2 88 62
3 90 65
4 86 68
5 81 66
6 80 69
7 79 70
Add: hold on/off & legend

16. “if-elseif-else” Statements
Example:
A = ones(2,3);
B = rand(3,4);
If (isequal(size(A),size(B)))
C = [A,B];
else
disp(‘A and B are not the same
size.’)
C = [ ];
end
if (expression)
statements
elseif (expression)
statements
else
statements
end

17. Loops
There are 2 types of loops:
● FOR loops
● WHILE loops
Loops must also be closed with and END
Loops can be broken using BREAK

18. FOR Loops
Example:
x=[5,4,8,7,10]
z=[];
for i=1:5 % amount of iterations
z(i)=x(i)*2 %do something
end % always end
RESULT:
z=[10,8,16,14,100]

19. FOR Loops and Conditional Statements
Example:
x=[5,4,8,7,0,10]
z=[];
for i=1:6
If x(i)==0 % can add if-else in
loop
Break; % stops the code
else
z(i)=x(i)*2
end
end
RESULTS:
z=[10,8,16,14]

20. WHILE Loops
Example:
x=0;
while x<10 % continue until condition is false
x=x+1;
end
RESULT:
x=10

21. Functions
● Function: Functions, written in
scripts, are used to simplify entire
scripts into one function with
inputs and outputs
○ A function behave like: y = mx +b,
where y=output & x=input
● In script:
function [output] = name[input]
do something
end
● In command window
out = name(in);

22. Relevance
For Electrical Engineers
● Computational biology
● Image and video
processing
● Optimization
● Partial Differential
Equations
● Signal Processing and
Communications
● Statistical and Data
Analysis
● Etc
For Mechanical Engineering
● Statics and Dynamics
● Mechanical Vibrations
● Numerical Methods
● Finite Element Analysis

23. Problems