[l2h] Black bars under integral signs when the limits of integration are -\infty and +\infty or an algebraic fraction for each of the upper and lower limits

Tue Apr 12 21:43:13 CEST 2011

P.S. I don't understand how changing the $MATH_SCALE_FACTOR can be a 
reliable solution.  Based on my understanding, all that does is tweak 
the probabilities of getting spurious black bars.

If you can reproduce this problem in the version I am using, I will 
go after it.

Cheers,
Julius

At 12:39 PM 4/12/2011, jos wrote:
> From my online document, you can download the version I was (and 
> am) using.  It is a patch of a 2002 version of LaTeX2HTML.  I'm 
> glad to hear a Version 2008 now exists.  You might point the 
> maintainer(s) to my documentation of problems and workarounds, 
> since it sounds like they haven't yet traversed them all. I look 
> forward to upgrading myself once all known bugs are fixed. - jos
>
>At 09:24 PM 4/11/2011, Pat Somerville wrote:
>>Thanks, JOS, for kindly taking the time to reply to me.  Did you find your
>>workaround solutions to eliminate unwanted black line segments to work in a
>>version of LaTeX2HTML different from the one I am using?  I tried the two
>>workaround solutions you mentioned with LaTeX2HTML Version 2008 (1.71):
>>
>>1) $DVIPSOPT = ' '; in the file /usr/lib/latex2html/l2hconf.pm in place of
>>$DVIPSOPT .= " -E";              ;
>>
>>2) Including the line "transform round exch round exch itransform" right
>>after the line "gsave newpath" in the file
>>/usr/lib/texmf/dvips/config/alt-rule.pro [The path for the file alt-rule.pro
>>is slightly different in LaTeX2HTML Version 2008 (1.71) than the path
>>mentioned within the version of the file alt-rule.pro replacing alt-rule.pro
>>in LaTeX2HTML Version 2008 (1.71).].
>>
>>And for the tests I returned to "$MATH_SCALE_FACTOR=1.6;", without the
>>double quotation marks, within the file /usr/lib/latex2html/l2hconf.pm.  But
>>unfortunately in my case the workaround 1 and the combination of the
>>workarounds 1 and 2 did not remove the unwanted black line segment
>>underneath an integral sign in the .html file produced by a latex2html
>>command working with the .tex file containing the LaTeX command \int\limits
>>_{-\infty}^{+\infty} within an equation environment.  I also tried single
>>quotation marks or apostrophes in place of double quotation marks in the
>>line $DVIPSOPT = " -E"; in the file l2hconf.pm; but still the unwanted black
>>line segments remained within the produced .html file.   So I still request
>>help to remove the unwanted black line segments underneath some of my
>>integral signs.
>>
>>Pat
>>
>>--------------------------------------------------
>>From: "jos" <j at w3k.org>
>>Sent: Monday, April 11, 2011 5:02 PM
>>To: "Pat Somerville" <l_pat_s at hotmail.com>
>>Cc: <latex2html at tug.org>
>>Subject: Re: [l2h] Black bars under integral signs when the limits 
>>ofintegrationare -\infty and +\infty or an algebraic fraction 
>>for  each of the upper and
>>lower limits
>>
>>>Here is how I got around the black-bar problem:
>>>
>>>https://ccrma.stanford.edu/~jos/webpub/Eliminating_Black_Rules_Equation.html
>>>
>>>- jos
>>>
>>>At 12:15 PM 4/11/2011, Pat Somerville wrote:
>>>>Thanks, Nasser M. Abbasi, for kindly taking the time to reply to me.  I
>>>>found the file /usr/lib/latex2html/l2hconf.pm.  In it among other lines
>>>>the following lines existed, but not necessarily consecutively:
>>>>
>>>>$DVIPSOPT .=" -E"; (Please notice the period before the equals sign.)
>>>>
>>>>$MATH_SCALE_FACTOR=1.6;
>>>>
>>>>#$DISP_SCALE_FACTOR=1;
>>>>
>>>>So after receiving your e-mail letter I changed two of those lines to
>>>>read:
>>>>
>>>>$MATH_SCALE_FACTOR=1.8;
>>>>
>>>>$DISP_SCALE_FACTOR=1.0;
>>>>.
>>>>Results in the .html file produced by LaTeX2HTML: The black line segment
>>>>under the integral sign with the limits of integration having algebraic
>>>>fractions in them was removed.  But the black line segments under integral
>>>>signs produced from the LaTeX commands containing \int\limits
>>>>_{-\infty}^{+\infty} remained.  Those were probably among 27 reported
>>>>errors on 27 images.  I don't know with which images all of the other
>>>>errors were. But I think I remember at least one pnmcrop-related error
>>>>while latex2html was processing my .tex file.
>>>>
>>>>Next I changed to $MATH_SCALE_FACTOR=2.0; in the file l2hconf.pm and
>>>>otherwise did not change any other lines in that file.
>>>>
>>>>Results: There were errors on 27 images.  The black segment under the
>>>>integral sign with algebraic fractional limits returned.
>>>>
>>>>Continuing with the same settings in l2hconf.pm I made a test, .tex file
>>>>containing some commands very similar to
>>>>
>>>>\begin{equation}
>>>>\int\limits _{-\infty}^{+\infty}
>>>>\end{equation}
>>>>
>>>>and then produced a .html file from that .tex file using a latex2html...
>>>>command.  In the resulting .html file a black line segment existed under
>>>>the integral sign with the limits of positive and negative infinity.  What
>>>>should I do now to try to eliminate the unwanted black line segments under
>>>>some of the integral signs?  Note also that there were also around 20
>>>>images with errors reported while latex2html attempted to generate them;
>>>>and in detail I don't yet know what obvious problems there were, if any,
>>>>with the associated mathematical symbols associated with the images for
>>>>which errors were reported by LaTeX2HTML.
>>>>
>>>>Pat
>>>>
>>>>--------------------------------------------------
>>>>From: "Nasser M. Abbasi" <nma at 12000.org>
>>>>Sent: Monday, April 11, 2011 1:37 AM
>>>>To: <latex2html at tug.org>
>>>>Subject: Re: [l2h] Black bars under integral signs when the limits
>>>>ofintegrationare -\infty and +\infty or an algebraic fraction        for
>>>>each of the upper and lower limits
>>>>
>>>>>On 4/10/2011 10:29 PM, Pat Somerville wrote:
>>>>>
>>>>>>Question: What can I do to eliminate all of such examples of unwanted
>>>>>>black bars
>>>>>>  underneath some of the integral signs?
>>>>>
>>>>>This sounds like the same known problem which was mentioned here some
>>>>>time ago?
>>>>>
>>>>>Check  http://12000.org/my_notes/l2hwin/index.htm and look for
>>>>>
>>>>>item (2) under "some errors and possible solutions"
>>>>>
>>>>>Here it is:
>>>>>
>>>>>"some of the bitmap images produced for the mathematics in the
>>>>>document have a solid dark bar, usually at the bottom or the
>>>>>side of the bitmap image. The reason for this is unknown.
>>>>>But I found by trial and error that setting the following
>>>>>values in my l2hconf.pm eliminated most if not all of these
>>>>>
>>>>>$MATH_SCALE_FACTOR = 1.8;
>>>>>$DISP_SCALE_FACTOR = 1.0;
>>>>>
>>>>>"
>>>>>
>>>>>Something to try to see if it will fix your problem.
>>>>>
>>>>>--Nasser
>>>>>_______________________________________________
>>>>>latex2html mailing list
>>>>>latex2html at tug.org
>>>>>http://tug.org/mailman/listinfo/latex2html
>>>>_______________________________________________
>>>>latex2html mailing list
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>>_______________________________________________
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>
>
>Julius O. Smith III <jos at ccrma.stanford.edu>
>Prof. of Music and Assoc. Prof. (by courtesy) of Electrical Engineering
>CCRMA, Stanford University
>http://ccrma.stanford.edu/~jos/  