[LON-CAPA-admin] Dynamic Plots on Debian

[Matthew Brian Hall]

Todd,

It would be more useful to send us the error message listed in
/var/httpd/error_log

The plot.gif script should be the stock loncapa one.  Most likely
this is a gnuplot error.  When gnuplot barfs it does so in the
http error log.

Possibly (likely) yours does not have gif support.

Someday we'll move to another plotting solution and not have to deal
with this issue.  (don't let me get started)

Matthew

>
> Guy,
>
> I am making progress on this. . .
>
> I did the below, restarted both loncontrol and httpd.  Now I get this
> when I try to view the image separately:
>
> The image
> "http://poisson.mines.edu/cgi-bin/plot.gif?file=truskell_csmTodd_1056580683_27
86645_plot.data&output=gif" cannot be displayed, because it contains errors.
>
> Any more ideas?  I'd be happy to send you the perl script in plot.gif if
> you think it'd help.
>
> Thanks,
>
> Todd
>
>
>
>
> On Wed, 2003-06-25 at 12:25, Guy Albertelli II wrote:
> > Hi Todd,
> >
> > > One problem I've run into is that dynamically generated plots don't seem
> > > to get generated/stored properly for me.  I just get the little broken
> > > image icon, and when I right-click on the image and try to view or
> > > download it, not surprisingly I get a Not Found error:
> > >
> > > The requested URL /cgi-bin/plot.gif was not found on this server.
> > >
> > > So I went poking for cgi-bin, and found one here:  /home/httpd/cgi-bin,
> > > as I think I expect.  However, it seems to have the following access
> > > privileges:
> >
> > What is in you httpd.conf for the  ScriptAlias?
> >
> > It should either not be set in there (and thus use the value
> > loncapa_apache.conf sets) or set to
> >
> > ScriptAlias /cgi-bin/ "/home/httpd/cgi-bin/"
> >
> >
> > It that is correct, can you look for error messages in
> > /var/log/apache/error.log  that mention plot.gif?
> >
> >
> > It most likely would be complaining about not being able to generate
> > gifs.
> >
> > The easiest solution to solve this is likely (as root):
> >
> > 1) apt-get remove libgd-dev gnuplot
> > 2) apt-get install libgd-gif1 libgd-gif1-dev
> > 3) wget http://aleron.dl.sourceforge.net/sourceforge/gnuplot/gnuplot-3.7.3.t
ar.gz
> > 4) tar xzvf gnuplot-3.7.3.tar.gz
> > 5) cd gnuplot-3.7.3
> > 6) ./configure --with-gd
> > 7) make
> > 8) make install
> >
> >
> > --
> > guy at albertelli.com  LON-CAPA Developer  0-7-6-7-
> > _______________________________________________
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> > LON-CAPA-admin at mail.lon-capa.org
> > http://mail.lon-capa.org/mailman/listinfo/lon-capa-admin
> >
>
>
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>


--
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Matthew Hall           LON-CAPA developer         hallmat3 at msu.edu
123 North Kedzie Hall                    Michigan State University
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