<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Is there any way to turn off the “snap to grid” feature in the Function Plot Response problems? <div><br></div><div>Some of the vector heads/tails that students have to manipulate are so close to certain grid junctions that the vector snaps to the junction, but that moves them to a position that the computer then evaluates as incorrect.<div><br></div><div>I have tried setting the grid visibility to off, but the snap to feature is still present.</div></div><div><br></div><div>An example of a problematic problem is shown below:</div><div><br></div><div><div><font face="Courier" size="1"><problem></font></div><div><font face="Courier" size="1"><script type="loncapa/perl"></font></div><div><font face="Courier" size="1">$IADx=&random(5400,6000,200);</font></div><div><font face="Courier" size="1">$BOSx=&random(4800,5200,50);</font></div><div><font face="Courier" size="1">$BOSy=&random(700,950,50);</font></div><div><font face="Courier" size="1">$d2=&sqrt(($IADx-$BOSx)**2+($BOSy)**2);</font></div><div><font face="Courier" size="1">$theta2=&atan(($IADx-$BOSx)/$BOSy)*$rad2deg;</font></div><div><font face="Courier" size="1">$dt=&sqrt(($BOSx)**2+($BOSy)**2);</font></div><div><font face="Courier" size="1">$thetat=&atan(($BOSx)/$BOSy)*$rad2deg;</font></div><div><font face="Courier" size="1"></script></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><startouttext /></font></div><div><font face="Courier" size="1">a) Amit flies due east from San Francisco (SFO) to Washington, D.C. (IAD), a displacement of &format($IADx,'1f') km. He then flies from Washington to Boston (BOS), a displacement of &format($d2,'1f') km at an angle of &format($theta2,'1f')° west of north. <p /></font></div><div><font face="Courier" size="1"><ol></font></div><div><font face="Courier" size="1"><li>In the diagram below the black vectors can be moved by grabbing them in the center and they can be adjusted by grabbing the blue dots at either end.</li></font></div><div><font face="Courier" size="1"><li>The red vector automatically adjusts itself and you should not try to change its position or length manually.</li></font></div><div><font face="Courier" size="1"><li>Move and adjust the SFOtoIAD vector so it originates at SFO and terminates at IAD.</li></font></div><div><font face="Courier" size="1"><li>Move and adjust the IADtoBOS vector so it originates at IAD and terminates at BOS.</li></font></div><div><font face="Courier" size="1"><li>Notice that the red resultant vector changes as you change the other two vectors.</li></font></div><div><font face="Courier" size="1"><li>When you have adjusted the black vectors as described, press the submit button.</li></font></div><div><font face="Courier" size="1"></ol></font></div><div><font face="Courier" size="1"><endouttext /></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><part id="a"></font></div><div><font face="Courier" size="1"><center></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><functionplotresponse id="11" ymin="-200" xaxisvisible="no" width="450" gridvisible="yes" ymax="1200" height="250" yaxisvisible="no" xmax="6200" xmin="-200"></font></div><div><font face="Courier" size="1"><functionplotelements></font></div><div><font face="Courier" size="1"><plotobject x="0" y="0" label="SFO" /></font></div><div><font face="Courier" size="1"><plotobject label="IAD" y="0" x="$IADx" /></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><plotobject x="$BOSx" y="$BOSy" label="BOS" /></font></div><div><font face="Courier" size="1"><plotvector taily="800" tailx="2000" tipy="800" tipx="3000" label="SFOtoIAD" /></font></div><div><font face="Courier" size="1"><plotvector label="IADtoBOS" taily="500" tailx="2000" tipy="500" tipx="3000" /></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><drawvectorsum label="Resultant" vectorlist="SFOtoIAD,IADtoBOS" showvalue="yes" tailx="0" taily="0" /></font></div><div><font face="Courier" size="1"></functionplotelements></font></div><div><font face="Courier" size="1"><functionplotruleset></font></div><div><font face="Courier" size="1"><functionplotvectorrule vector="SFOtoIAD" index="SFOtoIAD" tippoint="IAD" tailpoint="SFO" /></font></div><div><font face="Courier" size="1"><functionplotvectorrule vector="IADtoBOS" index="IADtoBOS" tippoint="BOS" tailpoint="IAD" /></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><functionplotvectorsumrule index="Total" vectors="SFOtoIAD,IADtoBOS" /></font></div><div><font face="Courier" size="1"></functionplotruleset></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"></functionplotresponse></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"></center></font></div><div><font face="Courier" size="1"></part></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><part id="b"></font></div><div><font face="Courier" size="1"><startouttext /></font></div><div><font face="Courier" size="1">b) What is the magnitude of Amit's total displacement?</font></div><div><font face="Courier" size="1"><endouttext /></font></div><div><font face="Courier" size="1"><numericalresponse format="2f" answer="$dt" unit="km" id="12"></font></div><div><font face="Courier" size="1"><responseparam description="Numerical Tolerance" type="tolerance" name="tol" default="5%" /></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"> <textline spellcheck="none" readonly="no" /></font></div><div><font face="Courier" size="1"> </font></div><div><font face="Courier" size="1"></numericalresponse></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"><br></font></div><div><font face="Courier" size="1"></part></font></div><div><font face="Courier" size="1"></problem></font></div></div><div><br></div><div><br></div><div>Any suggestions would be appreciated.</div><div><br></div><div>Best,</div><div>Jon Hall</div><div><br></div><div><br></div><div><br></div></body></html>