Page 36 - Applied Numerical Methods Using MATLAB

BASIC OPERATIONS OF MATLAB 25
Table 1.4 Relational Operators and Logical Operators
Relational Relational Logical
Remark Remark Remark
operator operator operator
< less than > greater than & and
<= less than or equal to >= greater than or equal to | or

== equal ~= not equal(=) ~ not

Let us see the following examples:
Example 1. A Simple if-else-end Block

%nm119_1: example of if-end block
t=0;
ift>0
sgnt = 1;
else
sgnt = -1;
end

Example 2. A Simple if-elseif-end Block

%nm119_2: example of if-elseif-end block
ift>0
sgnt = 1
elseift<0
sgnt = -1
end

Example 3. An if-elseif-else-end Block

%nm119_3: example of if-elseif-else-end block
ift>0, sgnt = 1
elseif t<0, sgnt = -1
else sgnt = 0
end

Example 4. An if-elseif-elseif-..-else-end Block

%nm119_4: example of if-elseif-elseif-else-end block
point = 85;
if point >= 90, grade = ’A’
elseif point >= 80, grade = ’B’
elseif point >= 70, grade = ’C’
elseif point >= 60, grade = ’D’
else grade = ’F’
end