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Annotation of loncom/homework/templates/Plot_data.problem, revision 1.6

1.1       matthew     1: <problem>
                      2: 
                      3: <script type="loncapa/perl">
1.6     ! www         4: #
        !             5: # This example populates arrays with the x and y coordinates of the plot.
        !             6: # For continuous functions, another approach is to use curve plots.
        !             7: #
1.4       www         8: $amplitude = &random(1,4,0.5);
                      9: $x_min = -5;
                     10: $x_max =  5;
                     11: for ($x=$x_min;$x<=$x_max;$x=$x+0.05) {
                     12:    push(@X,$x);
                     13:    push(@Y,$amplitude*sin($x));
1.6     ! www        14: # Safeguard:
        !            15: # The following line limits the size of the array to 1000 to avoid infinite loops
        !            16:    if (($#X>1000) || ($#Y>1000)) { last; }
1.4       www        17: }
1.1       matthew    18: </script>
                     19: 
1.3       albertel   20: <gnuplot width="300" transparent="off" samples="100" grid="on" font="9" bgcolor="xffffff" height="300" align="left" fgcolor="x000000" border="on" plottype="Cartesian" >
1.4       www        21:     <axis xmin="$x_min" ymin="-5" xmax="$x_max" ymax="5" color="x000000" />
1.1       matthew    22:     <xlabel>Label X</xlabel>
                     23:     <ylabel>Label Y</ylabel>
                     24:     <curve linestyle="linespoints" name="My Plot" pointtype="0" color="x000000">
1.4       www        25:         <data>@X</data>
                     26:         <data>@Y</data>
1.1       matthew    27:     </curve>
                     28: </gnuplot>
                     29: 
1.5       bisitz     30: <startouttext />
                     31: What is the amplitude of this function?
                     32: <endouttext />
1.1       matthew    33: 
1.4       www        34: <numericalresponse answer="$amplitude" format="2s">
1.1       matthew    35:     <responseparam name="tol" type="tolerance" description="Numerical Tolerance" default="5%" />
1.4       www        36:     <textline readonly="no" />
1.5       bisitz     37: </numericalresponse>
1.4       www        38: 
1.1       matthew    39: </problem>