[LON-CAPA-admin] xtics and gnuplot

[H. K. Ng]

Hi Stuart,

Thanks for fixing this. I figured it must have something to do with the yum
update I did.

Regards,
-hk


On Wed, Jul 9, 2014 at 11:45 AM, Stuart Raeburn <raeburn at msu.edu> wrote:

> Hi Hon-Kie,
>
> > A strange thing happen with gnuplot and xtics (running on 2.10.1). When
> > using the line below, the graph is not generated or printed.
>
> If you have updated your server to LONCAPA-prerequisites rev 1.23 (for
> LON-CAPA 2.11.0) that will have updated gnuplot from rev 4.2 to rev 4.4.
>
> Unfortunately, a change between those two versions of gnuplot results
> in a gnuplot error when creating a plot in which either the xtics or
> ytics tags have been included, and location has been set to "axis",
> (for the case where you are running LON-CAPA 2.10.1 with gunplot 4.4).
>
> You can display the version of gnuplot you have using:
>
> gnuplot -V
>
> A change was made to lonplot.pm (included in 2.11.0) to accommodate
> this gnuplot change.
>
> If you are running LON-CAPA 2.10.1, and the version of gnuplot
> installed is 4.4 or later, and you do not plan to update to 2.11.0
> immediately, then you should replace the version of lonplot.pm (1.152)
> shipped with 2.10.1 with a modified version (1.152.6.1), which
> includes the patch for xtics/ytics location=axis support for gnuplot 4.4
>
>  From the command line, use the command (all one one line):
>
> wget -O /home/httpd/lib/perl/Apache/lonplot.pm
> '
> http://source.loncapa.org/cgi-bin/cvsweb.cgi/~checkout~/loncom/xml/lonplot.pm?rev=1.152.6.1;content-type=text/plain
> '
>
> then, depending on Linux distro:
>
> /etc/init.d/httpd reload      (CentOS, Scientific Linux, RedHat, Fedora)
>
> or
>
> /etc/init.d/apache2 reload  (Ubuntu, SLES, SuSE)
>
>
> Stuart Raeburn
> LON-CAPA Academic Consortium
>
>
> Quoting "H. K. Ng" <hkng at fsu.edu>:
>
> > Hi,
> >
> > A strange thing happen with gnuplot and xtics (running on 2.10.1). When
> > using the line below, the graph is not generated or printed. On the web
> it
> > says "dynamically generated ..." but no graphics and when printing, it
> > complains about "Cannot determine the size of graphics ..." presumably
> > because the eps was not generated.
> >
> > <xtics minorfreq="1" location="axis" mirror="off" end="16" increment="2"
> > start="0" />
> >
> > However, if I use the following line (location of tics changed to
> border),
> > it displays on the web and print just fine.
> >
> > <xtics minorfreq="1" location="border" mirror="off" end="16"
> increment="2"
> > start="0" />
> >
> > I tried to look for error messages but could not locate any. Any clue
> what
> > is causing this? The problems display properly - it happen in the last
> > couple of days.
> >
> > Thanks,
> > -hk
>
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