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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone who knows how to use Geogebra within LON-CAPA know how to do this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am trying to make a functionplotresponse question that requires students to draw a vector pointing straight up from and attached to the x-axis, but without drawing an explicit attachment point on the axis.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I use this approach it works, but the vector tail attaching point is plotted and visible:<o:p></o:p></p>
<p class="MsoNormal"><functionplotelements><o:p></o:p></p>
<p class="MsoNormal"><plotobject label="F1a_tail" x="6" y="0" /><o:p></o:p></p>
<p class="MsoNormal"><plotvector label="F1a" tailx="7" taily="1" tipx="8" tipy="1" /><o:p></o:p></p>
<p class="MsoNormal">…<o:p></o:p></p>
<p class="MsoNormal"></functionplotelements><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><functionplotruleset><o:p></o:p></p>
<p class="MsoNormal"> <functionplotvectorrule index="Harmonic_1a" vector="F1a" angle="90" angleerror="2" tailpoint="F1a_tail" length="11" lengtherror="0.5" /><o:p></o:p></p>
<p class="MsoNormal"></functionplotruleset> on the graph:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here is the result:<o:p></o:p></p>
<p class="MsoNormal"><img width="433" height="296" style="width:4.5104in;height:3.0833in" id="Picture_x0020_2" src="cid:image005.jpg@01D397A0.2AA69C80"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I change “F1a_tail” in the above code to “(6,0)” it does not work:<o:p></o:p></p>
<p class="MsoNormal"><img width="446" height="292" style="width:4.6458in;height:3.0416in" id="Picture_x0020_1" src="cid:image006.jpg@01D397A0.2AA69C80"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there a way I can specify a tail attachment point without showing it on the graph?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black">Gene L. Harding, PE<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Associate Professor of ECET<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">574-520-4190</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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