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<p class="MsoNormal">Hi, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am trying to display something (a gnuplot) only if the student has exceeded the maxtries for a problem and not gotten it correct. I used the following code in the perl script to check the problem status and set a flag ($status_a) to zero
only if maxtries is exceeded:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"># Check status: 'undef'=not attempted; 0=wrong but tries left; 1=correct; 2=maxtries exceeded; 3=after answer date<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">$status_a = &check_status('a');<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">if ($status_a ne 2) {$status_a=0;} # If maxtries not reached, set to 0 so conditional block does not execute<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Then I put the gnuplot code inside a conditional block:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><block condition="status_a"><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><gnuplot width="700" minor_ticscale="0.75" grid="off" align="right" font="9" height="500" border="on" samples="100"
<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> bgcolor="xffffff" fgcolor="x000000" alttag="Spectrum Plot" transparent="off" major_ticscale="2" plottype="Cartesian"><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <xtics minorfreq="1" location="border" mirror="on" end="$xtic_stop" increment="$xtic_incr" start="0" /><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <ytics minorfreq="1" location="border" mirror="on" end="20" increment="2" start="0" /><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <axis xmin="$x_min" ymax="$y_max" color="x000000" ymin="$y_min" xmax="$x_max" /><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <xlabel>Frequency (MHz)</xlabel><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <ylabel>Amplitude (V)</ylabel><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <curve linestyle="vector" linetype="solid" arrowangle="30" arrowstyle="filled" color="x000000" pointtype="4"
<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> linewidth="1" arrowhead="head" arrowlength="$arwhd" pointsize="1"><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><!-- vector plot requires 4 datasets: X, Y, deltaX, deltaY --><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <data>@f</data> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <data>@tails</data> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <data>@zeros</data> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <data>@mag</data> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> </curve><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"></gnuplot><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"></block><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I thought conditional blocks were skipped if the condition was zero, and executed for nonzero values, but the block is executing even when $status_a is zero. Can anyone see what I am doing wrong? Is there a better/easier way to do this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for any help/advice you can provide.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards,<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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