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Annotation of loncom/homework/templates/functionplotback.problem, revision 1.2

1.1       www         1: <problem>
                      2: <script type="loncapa/perl">$x=&random(-5,5,2);
                      3: $y=&random(-3,3,2);
                      4: $a=&random(0.5,0.9,0.1);
                      5: if (&random(0,1,1)) {
                      6:    $function="$a*(x-($x))^2+($y)";
1.2     ! www         7:    $answer="2*$a*(x-($x))";
1.1       www         8:    $relation='gt';
                      9: } else {
                     10:    $function="-$a*(x-($x))^2+($y)";
1.2     ! www        11:    $answer="-2*$a*(x-($x))";
1.1       www        12:    $relation='lt';
                     13: }</script>
                     14: <startouttext />
                     15: Provide a sketch of the derivative of the indicated function<br /> <endouttext />
1.2     ! www        16: <functionplotresponse xaxisvisible="yes" xlabel="x" gridvisible="yes" ylabel="y(x)" id="11" xmax="10" yaxisvisible="yes" xmin="-10" ymin="-10" ymax="10" answerdisplay="$answer">
1.1       www        17: <functionplotelements>
                     18: <spline initx="-4" inity="0" index="A" order="3" scalex="8" />
                     19: <backgroundplot function="$function" fixed="yes" />
                     20: </functionplotelements>
                     21: <functionplotruleset>
                     22: <functionplotrule relationship="eq" xinitial="$x" value="0" derivativeorder="0" percenterror="2" index="extreme" />
                     23: <functionplotrule relationship="$relation" xinitiallabel="start" xfinallabel="end" value="0" derivativeorder="1" percenterror="10" index="slope" />
                     24: <functionplotrule relationship="eq" xinitiallabel="start" xfinallabel="end" value="0" derivativeorder="2" percenterror="50" index="linear" />
                     25: </functionplotruleset>
                     26: </functionplotresponse>
                     27: </problem>