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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
<TITLE>FOR For Loop
</TITLE>
</HEAD>
<BODY>
<H2>FOR For Loop
</H2>
<P>
Section: <A HREF=sec_flow.html> Flow Control </A>
<H3>Usage</H3>
The <code>for</code> loop executes a set of statements with an
index variable looping through each element in a vector.
The syntax of a <code>for</code> loop is one of the following:
<PRE>
for (variable=expression)
statements
end
</PRE>
<P>
Alternately, the parenthesis can be eliminated
<PRE>
for variable=expression
statements
end
</PRE>
<P>
or alternately, the index variable can be pre-initialized
with the vector of values it is going to take:
<PRE>
for variable
statements
end
</PRE>
<P>
The third form is essentially equivalent to <code>for variable=variable</code>,
where <code>variable</code> is both the index variable and the set of values
over which the for loop executes. See the examples section for
an example of this form of the <code>for</code> loop.
<H3>Examples</H3>
Here we write <code>for</code> loops to add all the integers from
<code>1</code> to <code>100</code>. We will use all three forms of the <code>for</code>
statement.
<PRE>
--> accum = 0;
--> for (i=1:100); accum = accum + i; end
--> accum
ans =
5050
</PRE>
<P>
The second form is functionally the same, without the
extra parenthesis
<PRE>
--> accum = 0;
--> for i=1:100; accum = accum + i; end
--> accum
ans =
5050
</PRE>
<P>
In the third example, we pre-initialize the loop variable
with the values it is to take
<PRE>
</PRE>
<P>
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