<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Dismiss
Skip Navigation

3.1: Basic Mathematical Operations

Difficulty Level: At Grade Created by: CK-12

Operations and Expressions

An m-file environment has all of the standard arithmetic operations (addition, subtraction, etc.) and functions (sine, cosine, logarithm, etc.). Table 1 lists the most commonly used operations; in this table, and are scalars. (A scalar is a single value, as opposed to a vector or matrix which consists of many values.)

Some Common Scalar Mathematical Operations.
Operation m-file
x - y
x + y
x*y
x/y
x^y
exp(x)
log10(x)
log(x)
log2(x)
cos(x)
sin(x)
sqrt(x)

Expressions are formed from numbers, variables, and these perations. The operations have different precedences. The

^

operation has the highest precedence;

^

operations are evaluated before any other operations. Multiplication and division have the next highest precedence, and addition and subtraction have the lowest precedence. Precedence is altered by parentheses; expressions within parentheses are evaluated before expressions outside parentheses.

Example 1

Table 2 below shows several mathematical formulas, the corresponding expressions, and the values that are computed for the expressions.

Example Expressions
formula MATLAB Expression Computed Value
5^2+4^2
41
(5+4)^2
81
(2 + 3)/(4 - 5)
log10(100)
2
log(4*(2 + 3))
2.9957

Useful Tricks

These tricks are occasionally useful, especially when you begin programming with m-files.

  • A semicolon added at the end of a line suppresses the output.
  • Often it is useful to split input over multiple lines. To split a statement across multiple lines, enter three periods ... at the end of the line to indicate it continues on the next line.

Example 2

You could split the expression over multiple lines as follows:
(2+3)...
/(4-5)

Image Attributions

Show Hide Details
Files can only be attached to the latest version of section
Reviews
50 % of people thought this content was helpful.
1
Loading reviews...
Please wait...
Please wait...
Image Detail
Sizes: Medium | Original
 
CK.ENG.ENG.SE.1.Engineering-Matlab.3.1

Original text