Hi,
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:
# Check status: 'undef'=not attempted; 0=wrong but tries left; 1=correct;
2=maxtries exceeded; 3=after answer date
$status_a = &check_status('a');
if ($status_a ne 2) {$status_a=0;} # If maxtries not reached, set to 0 so
conditional block does not execute
Then I put the gnuplot code inside a conditional block:
<block condition="status_a">
<gnuplot width="700" minor_ticscale="0.75" grid="off" align="right" font="9"
height="500" border="on" samples="100"
bgcolor="xffffff" fgcolor="x000000" alttag="Spectrum Plot"
transparent="off" major_ticscale="2" plottype="Cartesian">
<xtics minorfreq="1" location="border" mirror="on" end="$xtic_stop"
increment="$xtic_incr" start="0" />
<ytics minorfreq="1" location="border" mirror="on" end="20" increment="2"
start="0" />
<axis xmin="$x_min" ymax="$y_max" color="x000000" ymin="$y_min"
xmax="$x_max" />
<xlabel>Frequency (MHz)</xlabel>
<ylabel>Amplitude (V)</ylabel>
<curve linestyle="vector" linetype="solid" arrowangle="30"
arrowstyle="filled" color="x000000" pointtype="4"
linewidth="1" arrowhead="head" arrowlength="$arwhd" pointsize="1">
<!-- vector plot requires 4 datasets: X, Y, deltaX, deltaY -->
<data>@f</data>
<data>@tails</data>
<data>@zeros</data>
<data>@mag</data>
</curve>
</gnuplot>
</block>
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?
Thanks for any help/advice you can provide.
Best regards,
Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
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