Re: [EP-underground] enabling latex features

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Thanks for helping me,

                       Francis Lowenthal

ePrints Support wrote:

> Right! The latex code uses the MD5 module which you may not have installed?
>
> It caches all the images it makes in the archives own directory, filenames
> are MD5's of the latex string (this saves a huge load).
>
> I'm sorry this is proving so hard. It's a fairly complex option and uses
> lots of external tools.
>
> My gut tells me that you have a cache of {\pi}r^2 so it's using that, but
> as the^3 one is not cached it is generating it and something is broken
> in the generating.
>
> On Thu, Jul 25, 2002 at 04:03:39PM +0300, Malka Cymbalista wrote:
> > I seem to be having a very hard time getting eprints to display tex code. something very strange is happening.  When I give the URL http://wisdomarchive.wisdom.weizmann.ac.il/perl/latex2png?latex={\pi}r^2 I get back the expected equation.  If, however, I change the equation in any way, for example
> > http://wisdomarchive.wisdom.weizmann.ac.il/perl/latex2png?latex={\pi}r^3 then I get no result (I am told that the document contains no data) and when I look in the error log it tells me that it failed on the convert because it failed to find one of the libraries.  But how could it work for \pi r^2 but not for \pi r^3?
> >
> > (BTW, when I simply run convert from the command line as the user who is running apache, it works properly.  I have put the LD_LIBRARY_PATH in the .cshrc and .login files of the user who is running the httpd process so I don't understand this at all.)
> >
> > In addition, after I changed the render method in ArchiveMetadataConfig.pm I ran generate_abstracts as per your suggestion. The html code that was generated wherever there is tex code is something like the following:
> > <img alt="$\epsilon$" border="0"
> > src="http://wisdomarchive.wisdom.weizmann.ac.il/perl/latex2png?latex=%24%5Cepsilon%24"
> > align="absbottom" />
> >
> > which doesn't get rendered properly on the screen I assume because of the problem I described above.  Is this what is supposed to get generated?
> >
> > Any help will be greatly appreciated.
> >
> > Malki Cymbalista
> > Webmaster, Weizmann Institute of Science
> > Rehovot, Israel 76100
> > Internet: [email protected]
> >
> > >>> [email protected] 07/25/02 01:59PM >>>
> > Ah. It depends where your looking. It *should* work in /perl/ but you may
> > need to regenerate the views and abstracts. Normally you never have to change
> > the abstract pages, they get re-written if the data changes. If the render-
> > method changes you have to rebuild them by hand by running generate_abstracts.
> >
> > generate_abstracts should *not* be run daily (unless you really want to for
> > some reason)
> >
> > On Wed, Jul 24, 2002 at 05:00:11PM +0300, Malka Cymbalista wrote:
> > > Thanks for your reply.  I edited ArchiveMetadataConfig.pm and changed one of the lines to read:
> > >
> > > { name => "abstract", input_rows => 10, type => "longtext", render_single_value => \&EPrints::Latex::render_string },
> > >
> > > I added the render_single_value property to several different field items.
> > > I saved the file and restarted the web server.  I still do not see nicely formatted TeX output.  Is there anything else I must do?
> > >
> > > Malki Cymbalista
> > > Webmaster, Weizmann Institute of Science
> > > Rehovot, Israel 76100
> > > Internet: [email protected]
> > >
> > > >>> [email protected] 07/24/02 01:11PM >>>
> > > That's the one. I didn't check the filename.
> > >
> > > the render_single_value is a property that should appear in the comma seperated
> > > field properties list, like "name", "type" or "input_cols"
> > >
> > > On Wed, Jul 24, 2002 at 09:59:27AM +0300, Malka Cymbalista wrote:
> > > > Thanks very much for your reply.  I had a hard time getting convert to work properly but I now get proper mathematical output when I go to
> > > > http://--archiveurl--/perl/latex2png?latex={\pi}r^2
> > > >
> > > > However, I cannot find the file ArchiveMetadataConfig.pm.  Where is it supposed to be?  I did a
> > > >      find . - name ArchiveMetadataConfig.pm
> > > > in the highest eprints directory but nothing shows up.
> > > >
> > > > I did find a file ArchiveMetadataFieldsConfig.pm.  Is that the one?  But I could not figure out where to put the line
> > > >   render_single_value => \&EPrints::Latex::render_string
> > > >
> > > > Any help will be appreciated.  Thank you.
> > > >
> > > >
> > > > Malki Cymbalista
> > > > Webmaster, Weizmann Institute of Science
> > > > Rehovot, Israel 76100
> > > > Internet: [email protected]
> > > >
> > > > >>> [email protected] 07/15/02 02:08PM >>>
> > > > First you should check it's working... try
> > > >
> > > > http://--archiveurl--/perl/latex2png?latex={\pi}r^2
> > > >
> > > > Which should return the image of an equation.
> > > >
> > > > The most likely problem you'll have is it not knowing where latex/convert etc.
> > > > are, in which case edit /opt/eprints2/perl_lib/EPrints/SystemSettings.pm
> > > >
> > > > THEN:
> > > >
> > > > In ArchiveMetadataConfig.pm add the following property to the text or
> > > > longtext field(s):
> > > >
> > > > render_single_value => \&EPrints::Latex::render_string
> > > >
> > > > This overrides the default field renderer with the latex aware one.
> > > >
> > > > On Mon, Jul 15, 2002 at 12:08:52PM +0300, Malka Cymbalista wrote:
> > > > > The eprints documentation says that there is an optional feature that
> > > > > allows eprints to look in certain fields for TeX looking text and
> > > > > display it as an image. When I originally installed eprints, I did not
> > > > > install latex.  I have since then installed  latex, dvips, and convert.
> > > > > How do I enable this feature?
> > > > > Thanks for any information.
> > > > >
> > > > > Malki Cymbalista
> > > > > Webmaster, Weizmann Institute of Science
> > > > > Rehovot, Israel 76100
> > > > > Internet: [email protected]
> > > >
> > > > --
> > > >
> > > >  Christopher Gutteridge                   [email protected]
> > > >  ePrints2 Coder, Support and Stuff        +44 23 8059 4833
> > > >
> > > >
> > > >
> > >
> > > --
> > >
> > >  Christopher Gutteridge                   [email protected]
> > >  ePrints2 Coder, Support and Stuff        +44 23 8059 4833
> > >
> > >
> > >
> >
> > --
> >
> >  Christopher Gutteridge                   [email protected]
> >  ePrints2 Coder, Support and Stuff        +44 23 8059 4833
> >
> >
>
> --
>
>  Christopher Gutteridge                   [email protected]
>  ePrints2 Coder, Support and Stuff        +44 23 8059 4833