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<div><h1 id="a0000000094">1.4 arrow</h1>
<p><a name="a0000001020" id="a0000001020"></a> </p><pre>
arrow [ item <id> ] [from] <vector> to <vector>
[ with { <option> } ]
</pre><p>Arrows may be drawn on multiplot canvases using the <tt class="tt">arrow</tt> command<a name="a0000001021" id="a0000001021"></a>. The style of the arrows produced may be specified by following the <tt class="tt">with</tt><a name="a0000001022" id="a0000001022"></a> modifier by one of the style keywords <tt class="tt">nohead</tt><a name="a0000001023" id="a0000001023"></a>, <tt class="tt">head</tt><a name="a0000001024" id="a0000001024"></a> (default) or <tt class="tt">twohead</tt><a name="a0000001025" id="a0000001025"></a>. In addition, keywords such as <tt class="tt">color</tt><a name="a0000001026" id="a0000001026"></a>, <tt class="tt">linewidth</tt><a name="a0000001027" id="a0000001027"></a> and <tt class="tt">linetype</tt><a name="a0000001028" id="a0000001028"></a> have the same syntax and meaning following the keyword <tt class="tt">with</tt><a name="a0000001029" id="a0000001029"></a> as in the <tt class="tt">plot</tt> command. The following example would draw a bidirectional blue arrow: </p><pre>
arrow from x1,y1 to x2,y2 with twohead linetype 2 color blue
</pre><p>The <tt class="tt">arrow</tt> command has a twin, the <tt class="tt">line</tt> command, which has the same syntax, but uses the default arrow style of <tt class="tt">nohead</tt><a name="a0000001030" id="a0000001030"></a>, producing short line segments. </p><p>All vector graphics objects placed on multiplot canvases receive unique identification numbers which count sequentially from one, and which may be listed using the <tt class="tt">list</tt> command. By reference to these numbers, they can be deleted and subsequently restored with the <tt class="tt">delete</tt> and <tt class="tt">undelete</tt> commands respectively. </p></div>
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