Introduction to If-Else Statement in Matlab
- If the statement executes code or statement block only when the condition is true. It is a conditional programming keyword used to give conditions to the program on Matlab.
- It has three parts if statement, else statement and else if statement if-else statement in Matlab.
- If the first expression or condition is true then ‘ if ’ statement executes. If the expression is false then else statement executes. And if there are multiple conditions in code then else if the statement is used in Matlab.
Syntax:
If (condition)
Statement
Else
Statement
end
Examples of If-Else Statement in Matlab
Here are some examples of the if-else statement in Matlab which are given below:
Example #1 – Simple If-Else Statements
let us consider an example to find a large or less than a specific number.
If a = 5 then we will find the number a is less than 10 or not.
Code:
a = 5
if ( a < 10 ) - - - - - condition 1
disp ( ' number is less than 10 ' ) - - - - - condition 1 is true
else
disp ( ' number is large than 10 ' ) - - - - - condition 1 is false
end
Output:
a = 5
the number is less than 10
Screen 1 shows the Matlab implementation of example 1.
Screen 1: Matlab implementation of example 1
Example #2 – Comparison of Two Numbers
Consider the second example to find out the maximum of two numbers. Let us take two number ‘ a ’ and ‘ b ’.
Code:
a = 10 and b = 15
clc ;
a = 10
b = 15
if ( a > b ) - - - - - condition 1
disp ( ' a is maximum ' ) - - - - - condition 1 is true
else
disp (' b is minimum ' ) - - - - - -condition 1 is false
end
Output:
a =10
b =15
b is maximum
Screen 2 shows the Matlab implementation of example 2.
Screen 2: Matlab implementation of example 2
Example #3 – Use of Nested if Statement
In this example, we will see a maximum of three numbers, let us consider three numbers a, b and c. a = 10 , b = 15 and c = 20.
Code:
clc ;
a = 10
b = 15
c = 20
if ( a > b ) - - - -condition 1
if ( a > c ) - - - nested if condition 2
disp ( ' a is maximum ' ) . . . .if condition 2 is true
else
disp ( ' c is maximum ' ) - - - -if condition 2 is false
end
end
if ( a < b ) - - - - - -condition 3
if ( b > c ) - - - - nested if condition 4
disp ( ' b is max ' ) if condition 4 is true
else
disp('c is max') if condition 4 is false
end
end
Output:
a =10
b =15
c =20
Ans =1
c is max
Screen 3 A shows the Matlab code of example 3 and screen 3 B shows the output of example 3.
Screen 3 A: Matlab implementation of 3 A
Screen 3 B: the output of example 3
Example #4 – Use of Logical Operators
Now let us consider one example to check the given number is within range or not.
In this example, we will see the use of the logical expression in if-else statements.
Code:
1. If a = 10
Clc ;
a = 10
min = 2
max = 20
if ( a > = min ) & & ( a < = max )
disp ( ' a is within range ' )
elseif ( a < = min )
disp ( ' a is less than minimum ' )
else
disp ( ' a is more than maximum value ' )
end
Output:
a =10
min =2
max =20
a is within range
2. If the value of a = 50
Code:
clc ;
a = 50
min = 2
max = 20
if ( a >= min ) & & ( a < = max )
disp ( ' a is within range ' )
elseif ( a < = min )
disp ( ' a is less than minimum ' )
else
disp ( ' a is more than maximum value ' )
end
Output:
a =50
min =2
max =20
a is more than the maximum value
3. If the value of a = 1
Code:
clc ;
a = 1
min = 2
max = 20
if ( a > = min ) & & ( a < = max )
disp ( 'a is within range ' )
elseif ( a < = min )
disp ( ' a is less than minimum ' )
else
disp ( ' a is more than maximum value ' )
end
Output:
a =1
min =2
max =20
a is less than a minimum
Conclusion
- Use of if-else statement makes complicated conditional problems easy and simple as well as we can create nested if operations to give condition inside one condition.
- In this ,expression includes logical operators like ‘ > ’ ( greater than) , ‘ < ’ ( less than ) , ‘ = = ’ (equal to) , ‘ > = ’ (greater than equal l to) , ‘ < = ’ ( less than equal to) , ‘ && ’ ( logical and ) , ‘ =! ’( not equal to) , ‘ || ’ ( logical or ) , etc.
Recommended Articles
This is a guide to IF-Else Statement in Matlab. Here we discuss the various examples of the if-else statements in Matlab along with different conditions and code implementation. You may also look at the following articles to learn more –
