[LON-CAPA-users] gnuplot labels

[Stuart Peter Raeburn]

Jay, 

Looks like you need to add 

    <key pos="bottom left" title="" box="off" /> 

to cause it to display the legend. (See second example in 
http://help.loncapa.org/fom/cache/150.html). I copied your xml code, added 
this line, and it worked on the VCU server (loncapa 2.0 on RHEL). Complete 
xml code will be in a separate direct e-mail. 

As regards location variables for the plot: note the x and y coordinates you 
use correspond to coordinates in the plot itself. 

So adding: 

<label justify="center" xpos="2" ypos="4">Plot label for VCU</label> 

to this plot added a label which appeared at the appropriate location (as 
the xpos and ypos values both fell within the range defined by the x and y 
axes). 

Stuart 

Stuart Raeburn
MSU LON-CAPA development/support 

James Sullivan writes: 

> Hi Stuart, 
> 
> Thanks for your email. I just tried what you suggested, but to no avail.
> Here is the problem xml code (after removing all the superfluous spaces): 
> 
> 
> [snip]
> <problem>
> <script type="loncapa/perl">
> $amplitude = &random(3,5,1);
> for ($x=-6.0; $x<=6.0; $x+=0.05) {
>      push @X,$x;
>      push @Y, $amplitude * sin($x);
> }
> </script>
> <gnuplot font="medium" width="400" grid="on" height="300" border="on"
> fgcolor="x000000" alttag="dynamically generated plot" align="center"
> bgcolor="xffffff" transparent="off">
>      <axis ymin="-6.0" ymax="6.0" xmin="-5.0" xmax="5.0" color="x000000"/> 
>      <curve linestyle="lines" pointtype="1" pointsize="1" name="test"
> color="x000000">
>          <data>@X</data>
>          <data>@Y</data>
>      </curve>
> </gnuplot>
> <startouttext/><br/>
> What is the amplitude of this function?
> <endouttext/>
> <numericalresponse answer="$amplitude">
> <responseparam type="tolerance" default="5%" name="tol"
> description="Numerical Tolerance"/>
> <responseparam name="sig" type="int_range,0-16" default="0,15"
> description="Significant Figures"/>
> </numericalresponse>
> </problem>
> [end] 
> 
> 
> I don't see any label on my plot. I expected to see "test" as the legend for
> the plot. On a related note, when I try to use the <label> tag to explicitly
> put a label in the plot, I cannot place it anywhere other than (0,0). I have
> tried setting the "location" variables x and y but they have no effect.
> Could you explicitly paste your code in an email and send it to me directly?
> Maybe I am just doing something silly.......... 
> 
> This is loncapa 2.0 on RHEL. 
> 
> Thanks for your help, and your patience with all my questions..... 
> 
> Jay 
> 
>  
> 
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