An interactive introduction to MATLAB

48 decision making

b) w=v

c)v < w+v

d) (v < w) +v

4.2 The if-else statement

The if,else, and elseifstatements inMATLAB provide methods of

controlling which parts of your code should execute based on whether certain

conditions are true or false. The syntax of the simplest form of anifstatement

is given in Listing 4.4.

Listing 4.4: Syntax of anifstatement

1 iflogical_expression

2 statements

3 end

Comments:

• Line 1 contains theifcommand, followed by an expression which must
  return true or false.


• Line 2 contains the body of theifstatement which can be a command or
  series of commands that will be executed if the logical expression returns
  true.


• Line 3 contains theendcommand which must always be used to close
  theifstatement.


• If the logical expression returns trueMATLABwill execute the state-
  ments enclosed betweenifandend. If the logical expression returns
  falseMATLABwill skip the statements enclosed betweenifandend
  and proceed with any following code.

Listing 4.5 presents a very simple example of using anifstatement to test if

a user has entered a number greater than 10.