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<HTML>
<HEAD>
<TITLE>ZEROLINES command</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<P><font size="+3" color="green"><B>ZEROLINES command</B></font></P>
<TABLE border="1" cols="2" frame="box" rules="all" width="572">
<TR>
<TD width="15%" valign="top"><B>Syntax</B>:</TD>
<TD width="85%" valign="top"><CODE>
ZEROLINES</CODE>
</TD></TR>
<TR>
<TD width="15%" valign="top"><B>Qualifiers</B>:</TD>
<TD width="85%" valign="top"><CODE>
\HORIZONTAL, \VERTICAL</CODE>
</TD></TR>
<TR>
<TD width="15%" valign="top"><B>Defaults</B>:</TD>
<TD width="85%" valign="top">
both horizontal and vertical lines drawn
</TD></TR>
<TR>
<TD width="15%" valign="top"><B>Examples</B>:</TD>
<TD width="85%" valign="top"><CODE>
ZEROLINES<br />
ZEROLINES\HORIZONTAL<BR />
ZEROLINES\VERTICAL</CODE>
</TD></TR>
</TABLE>
<P>
The <code>ZEROLINES</code> command draws horizontal and/or vertical lines on a graph through
<code>(0,0)</code> depending on the qualifier that is used.</P>
<p>
<center><table border="1" cols="2">
<tr><td align="center"><i>qualifier</i></td><td align="center"><i>result</i></td>
</tr><tr>
<td><code>\HORIZONTAL</code> </td>
<td>a line is drawn through (0,0) parallel to the <i>x</i>-axis,<br />
from the left edge to the right edge</td>
</tr><tr>
<td><code>\VERTICAL</code></td>
<td>a line is drawn through (0,0) parallel to the <i>y</i>-axis,<br />
from the bottom edge to the top edge</td></tr>
</table></center></p>
<p>
<font size="+2" color="green">Examples</font></p>
<p>
The following script produces the figure below.</p>
<p>
<font color="blue"><pre>
WINDOW 5
SCALES -5 5 -5 5
GRAPH\AXESONLY
SET CURVECOLOR RED
ZEROLINES
WINDOW 7
SCALES -5 5 -5 5
GRAPH\AXESONLY
SET CURVECOLOR RED
ZEROLINES/HORIZONTAL
WINDOW 12 25 0 75 50
SCALES -5 5 -5 5
GRAPH\AXESONLY
SET CURVECOLOR RED
ZEROLINES/VERTICAL
</font></pre></p>
<p>
<center><img src="zerolines1.png"></center></p>
</BODY>
</HTML>
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