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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
<TITLE>GLOBAL Global Variables
</TITLE>
</HEAD>
<BODY>
<H2>GLOBAL Global Variables
</H2>
<P>
Section: <A HREF=sec_variables.html> Variables and Arrays </A>
<H3>Usage</H3>
Global variables are shared variables that can be
seen and modified from any function or script that
declares them. The syntax for the <code>global</code> statement
is
<PRE>
global variable_1 variable_2 ...
</PRE>
<P>
The <code>global</code> statement must occur before the variables
appear.
<H3>Example</H3>
Here is an example of two functions that use a global
variable to communicate an array between them. The
first function sets the global variable.
<P>
<PRE>
set_global.m
function set_global(x)
global common_array
common_array = x;
</PRE>
<P>
The second function retrieves the value from the global
variable
<P>
<PRE>
get_global.m
function x = get_global
global common_array
x = common_array;
</PRE>
<P>
Here we exercise the two functions
<PRE>
--> set_global('Hello')
--> get_global
ans =
Hello
</PRE>
<P>
</BODY>
</HTML>
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