This document provides an introduction to MATLAB, including: - An overview of the MATLAB environment and command window for entering commands - Examples of using variables, built-in functions, and arithmetic operations in MATLAB code - An explanation of order of operations/precedence in MATLAB, with examples evaluating expressions involving exponents, multiplication/division, addition/subtraction, and parentheses - An assignment asking the reader to use MATLAB to compute some additional expressions.

1. Introduction to MATLAB

2. MATLAB Environment
Current
Directory
Command Window
Command History

3. Entering Commands in Expressions
Lab Session 1.1
>> 20/4 (ENTER)
ans =
5.0000

4. The default variable ans in MATLAB
Lab Session 1.3
>> ans * 4 (ENTER)
ans =
20.0000

5. Using variable in MATLAB programming
Lab Session 1.4
>> a = 10;
>> b = 20;
>> c = 30;
>> d = a + b;
>> e = c – b;
d
e
Result:
d=
30.0000
e=
10.0000

6. Using functions in MATLAB programming
Lab Session 1.5
>> a = sqrt(100)
a=
10.0000
Exercise:
Use MATAB built-in functions for finding average of 10 numbers. Also
find minimum and maximum of 10 numbers list.

7. Scalar Arithmetic Operations
Symbol
Operation
MATLAB form
^
exponentiation: ab
a^b
*
multiplication: a.b
a*b
/
right division:
a b
a/b
left division:
b a
ab
+
addition:
-
subtraction
a+b
a+b
a-b
a–b

8. Order of preference
Precedence
Operation
First
Parenthesis, evaluated starting with the innermost
pair.
Second
Exponentiation, evaluated from left to right.
Third
Multiplication and Division with equal precedence,
evaluated from left to right
Fourth
Addition and subtraction with equal precedence,
evaluated from left to right.

9. Lab Session 1.6
>> 8 + 3 * 5
ans=
23
>> 8 + ( 3 * 5)
ans=
23
>> ( 8 + 3 ) * 5
ans=
55
>> 4 ^ 2 – 12 – 8 / 4 * 2
ans=
0
>> 4 ^ 2 – 12 – 8 /( 4 * 2)
ans=
3
>>3*4^2 + 5
ans=
53
>>(3*4)^2 + 5
ans=
149
>>27^(1/3) + 32^(0.2)
ans=
5
>>27^(1/3) + 32^0.2
ans=
5
>>27^1/3 + 32^0.2
ans=
11

10. Now do this assignment
• Use MATLAB to compute the following
expressions: