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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<TITLE>IF-ELSEIF-ELSE Conditional Statements
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<BODY>
<H2>IF-ELSEIF-ELSE Conditional Statements
</H2>
<P>
Section: <A HREF=sec_flow.html> Flow Control </A>
<H3>Usage</H3>
The <code>if</code> and <code>else</code> statements form a control structure for
conditional execution. The general syntax involves an <code>if</code>
test, followed by zero or more <code>elseif</code> clauses, and finally
an optional <code>else</code> clause:
<PRE>
if conditional_expression_1
statements_1
elseif conditional_expression_2
statements_2
elseif conditional_expresiion_3
statements_3
...
else
statements_N
end
</PRE>
<P>
Note that a conditional expression is considered true if
the real part of the result of the expression contains
any non-zero elements (this strange convention is adopted
for compatibility with MATLAB).
<H3>Examples</H3>
Here is an example of a function that uses an <code>if</code> statement
<P>
<PRE>
if_test.m
function c = if_test(a)
if (a == 1)
c = 'one';
elseif (a==2)
c = 'two';
elseif (a==3)
c = 'three';
else
c = 'something else';
end
</PRE>
<P>
Some examples of <code>if_test</code> in action:
<PRE>
--> if_test(1)
ans =
one
--> if_test(2)
ans =
two
--> if_test(3)
ans =
three
--> if_test(pi)
ans =
something else
</PRE>
<P>
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