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Annotation of loncom/homework/templates/functionplottwo.problem, revision 1.5

1.1       www         1: <problem>
                      2: <script type="loncapa/perl">$x=&random(5,10,1);</script>
                      3: <startouttext />
                      4: Make a sketch of the electrostatic potential (zero at infinity) of a negative point charge located at x=$x m.
                      5: <endouttext />
1.4       www         6: <functionplotresponse xaxisvisible="yes" xlabel="x [m]" gridvisible="yes" ylabel="V(x) [V]" id="11" xmax="30" yaxisvisible="yes" xmin="-4" ymin="-10" ymax="10" answerdisplay="-4/abs(x-$x)">
1.2       www         7: <functionplotelements>
1.1       www         8: <spline initx="-2" inity="0" index="A" order="2" scalex="4" />
                      9: <spline index="B" order="2" initx="12" inity="0" scalex="4" />
1.2       www        10: </functionplotelements>
                     11: <functionplotruleset>
1.5     ! damieng    12: <functionplotrule relationship="eq" value="undef" xinitial="$x" index="chargeposition" derivativeorder="0" />
1.3       www        13: <functionplotrule relationship="lt" value="0" derivativeorder="0" xinitiallabel="start" xfinallabel="chargeleft" index="negleft" />
1.1       www        14: <functionplotrule relationship="lt" value="0" derivativeorder="1" xinitiallabel="start" xfinallabel="chargeleft" />
1.5     ! damieng    15: <functionplotrule relationship="le" value="0" derivativeorder="2" xinitiallabel="start" xfinallabel="chargeleft" percenterror="20" />
1.1       www        16: <functionplotrule relationship="eq" xinitiallabel="chargeleft" xfinallabel="chargeright" value="undef" derivativeorder="0" />
1.3       www        17: <functionplotrule relationship="lt" value="0" derivativeorder="0" xinitiallabel="chargeright" xfinallabel="end" index="negright" />
1.1       www        18: <functionplotrule relationship="gt" value="0" derivativeorder="1" xinitiallabel="chargeright" xfinallabel="end" />
1.5     ! damieng    19: <functionplotrule relationship="le" value="0" derivativeorder="2" xinitiallabel="chargeright" xfinallabel="end" percenterror="20" />
1.2       www        20: </functionplotruleset>
                     21: 
                     22: <hintgroup showoncorrect="no">
                     23: <hintpart on="chargeposition">
                     24: <startouttext />The charge is not in the correct position.<endouttext />
                     25: </hintpart>
1.3       www        26: <hintpart on="negleft">
                     27: <startouttext />The potential is zero at negative infinity, and the charge is negative.<endouttext />
                     28: </hintpart>
                     29: <hintpart on="negright">
                     30: <startouttext />The potential is zero at positive infinity, and the charge is negative.<endouttext />
                     31: </hintpart>
1.2       www        32: </hintgroup>
1.1       www        33: </functionplotresponse>
                     34: </problem>