r synonym) exists, use the RPN
operator `<font color="82140F"><code>defined</code></font>' (see <a href="ReversePolishMath.html#rpnMathematics">rpn Mathematics</a>).
<p>

<!-- @node   User Variables, Built-in Variables, About Variables, Variables -->
<a name="UserVariables" ></a>
<h3>10.4.2: User variables</h3>

You can get Gri to read values for variables from your file.  Here's how
to read a number from a header line and then read that many lines of
columnar data:
<p>
<TABLE SUMMARY="Example" BORDER="0" B