3.1: Basic Mathematical Operations
Operations and Expressions
An mfile 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,
Operation  mfile 


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 operations. 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 52+42 5^2+4^2 41(5+4)2 (5+4)^2 812+34−5 (2 + 3)/(4  5)log10(100) log10(100) 2ln(4(2+3)) log(4*(2 + 3)) 2.9957
Useful Tricks
These tricks are occasionally useful, especially when you begin programming with mfiles.
 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
2+34−5 over multiple lines as follows: 
(2+3)...

/(45)
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Date Created:
Feb 23, 2012Last Modified:
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