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<div class="textblock"><p>Section: <a class="el" href="sec_flow.html">Flow Control</a> </p>
<h1><a class="anchor" id="Usage"></a>
Usage</h1>
<p>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: </p>
<pre class="fragment"> 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 all non-zero elements (this strange convention is adopted for compatibility with MATLAB). </p>
<h1><a class="anchor" id="Examples"></a>
Examples</h1>
<p>Here is an example of a function that uses an <code>if</code> statement</p>
<pre class="fragment"> if_test.m
</pre><pre class="fragment">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:</p>
<pre class="fragment">--> if_test(1)
ans =
one
--> if_test(2)
ans =
two
--> if_test(3)
ans =
three
--> if_test(pi)
ans =
something else
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