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A. The simplest form of this structure is:
if expression
commands evaluated if expression is True
else
commands evaluated if expression is False
end

NOTES
1. The commands between the if and else statements are evaluated
if all elements in the expression are true.
2. The conditional expression uses the Boolean logical symbols &
(and), | (or), and ~ (not) to connect different propositions.

Example 1.9
Find for integer 0 < a ≤ 10, the values of C, defined as follows:

 ab for a > 5

C =  3
 ab for a ≤ 5
 2

and b = 15.

Solution: Edit and execute the following script M-file:

for a=1:10
b=15;
if a>5
C(a)=a*b;
else
C(a)=(a*b)*(3/2);
end
end

Check that the values of C that you obtain by typing C are:

22.5 45 67.5 90 112.50 90 105 120 135 150

B. When there are three or more alternatives, the if-else-end struc-
ture takes the form:
if expression 1
Commands 1 evaluated if expression 1 is True

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