I sent this note to Giuseppe, and it apparently worked correctly.
One thing I do is ensure that no hidden characters or spaces are affecting
results:
\documentclass{article}
\begin{document}%
\[%
k_v=\min\begin{cases}%
1 \\%
\frac{k_{n}(1+\frac{1,1i^{1,5}}%
{\sqrt{h}})}{\sqrt{h}(\sqrt{\alpha(1-\alpha)}+%
0,8\frac{x}{h}\sqrt{\frac{1}{\alpha}-\alpha^{2}})}%
\\%
\end{cases}%
\]%
\end{document}
This is generally good advice with LaTeX and friends - ensure that your results
are not being affected by what you don't see.
-----Original Message-----
From: tex4ht [mailto:tex4ht-boun...@tug.org] On Behalf Of Giuseppe Pica
Sent: Tuesday, February 10, 2015 10:36 AM
To: Michal Hoftich
Cc: tex4ht@tug.org
Subject: Re: [tex4ht] Black stripe on formula rendering
Hi Michal,
thanks for your fast reply.
My project is very huge, because I'm using the same latex source for dynamic
help (tex4ht) and printing (pdflatex).
My latex preamble loads many many packages, but I have no problems except that
in some formulas. It seems to happen in the formulas that make use of the cases
environment.
I also tried to use: \left{ \begin{array} ... \end{array} \right.
but the problem is the same.
However, there are cases where the "cases" environment does not give me
problems.
Regards.
-j
Il 10/02/2015 16:21, Michal Hoftich ha scritto:
> Hi Giuseppe,
>
> could you please post minimal working example which produces the
> error? When I tried
>
> -----
> \documentclass{article}
> \begin{document}
> \[
> k_v=\min\begin{cases}
> 1 \\
> \frac{k_{n}(1+\frac{1,1i^{1,5}}{\sqrt{h}})}{\sqrt{h}(\sqrt{\alpha(1-\a
> lpha)}+0,8\frac{x}{h}\sqrt{\frac{1}{\alpha}-\alpha^{2}})}
> \\
> \end{cases}
> \]
> \end{document}
>
> the output was correct. So maybe the problem is with some package you use.
>
> Regards,
> Michal
>
> 2015-02-10 12:39 GMT+01:00 Giuseppe Pica <jos...@gmail.com>:
>> Hi,
>> the following latex code produces a black stripe as shown in figure.
>>
>> \[
>> k_v=\min\begin{cases}
>> 1 \\
>> \frac{k_{n}(1+\frac{1,1i^{1,5}}{\sqrt{h}})}{\sqrt{h}(\sqrt{\alpha(1-\
>> alpha)}+0,8\frac{x}{h}\sqrt{\frac{1}{\alpha}-\alpha^{2}})}
>> \\
>> \end{cases}
>> \]
>>
>> http://www.iperspace.it/main121x.png
>>
>> How can I fix this?
>> Thanks in advance.
>> Regards
>> -j
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